Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Line of Credit Facility [Abstract] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Short-term Debt [Line Items] Short-term Debt [Line Items] Average daily amount of short-term debt outstanding Short-term Debt, Average Outstanding Amount Weighted daily average interest rate Short-term Debt, Weighted Average Interest Rate Maximum amount outstanding during the year Short-term Debt, Maximum amount outstanding during the year Short-term Debt, Maximum amount outstanding during the year Income Taxes [Abstract] Income Taxes [Abstract] Federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Federal tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent State and local taxes, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Flow through depreciation and cost basis differences Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective tax rate Effective Income Tax Rate Reconciliation, Percent Statement of Stockholders' Equity Parenthetical [Abstract] Statement of Stockholders' Equity Parenthetical [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Statement [Line Items] Statement [Line Items] Issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Price Risk Management [Abstract] Price Risk Management [Abstract] Derivative [Table] Derivative [Table] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Derivative [Line Items] Derivative [Line Items] Commodity contracts: [Abstract] Commodity contracts: [Abstract] Commodity contracts: [Abstract] Electricity Realized and Unrealized Gains and Losses, Net, Commodity Contracts, Electricity Realized and unrealized gains and losses, net on commodity contracts related to electricity not designated as hedging instruments included in purchased power and fuel expense in the statement of income. Natural Gas Realized and Unrealized Gains and Losses, Net, Commodity Contracts, Natural Gas Realized and unrealized gains and losses, net on commodity contracts related to natural gas not designated as hedging instruments included in purchased power and fuel expense in the statement of income. Realized And Unrealized Losses Net Commodity Contracts, Foreign Currency Realized And Unrealized Gains And Losses Net Commodity Contracts, Foreign Currency Realized And Unrealized Gains And Losses Net Commodity Contracts, Foreign Currency Employee Benefits [Abstract] Employee Benefits [Abstract] pension and other postretirement benefits valuation methodology [Policy Text Block] pension and other postretirement benefits valuation methodology [Policy Text Block] Pension and other postretirement benefits valuation methodology [Policy Text Block] Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block] Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block] Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block] Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block] Non-qualified benefit [Policy Text Block] Non-qualified benefit [Policy Text Block] Non-qualified benefit plans [Policy Text Block] Fair Value of Financial Instruments [Abstract] Fair Value of Financial Instruments [Abstract] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value, Option, Quantitative Disclosures [Table Text Block] Fair Value, Option, Quantitative Disclosures [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Regulatory Assets and Liabilities Disclosure [Abstract] Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Regulatory Asset [Axis] Regulatory Asset [Axis] Regulatory Asset [Domain] Regulatory Asset [Domain] Regulatory Assets [Line Items] Regulatory Assets [Line Items] Schedule of Regulatory Assets and Liabilities [Table Text Block] Schedule of Regulatory Assets and Liabilities [Table Text Block] Tabular disclosure of assets and liabilities that are created in connection with regulatory accounting [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Commodity [Axis] Commodity [Axis] Commodity [Axis] Commodity [Domain] Commodity [Domain] [Domain] for Commodity [Axis] Electricity [Member] Electricity [Member] Electricity [Member] Natural Gas [Member] Natural Gas [Member] Derivatives, Fair Value, by Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Derivative Liability, Fair Value, Amount Not Offset Against Collateral Derivative Liability, Fair Value, Amount Not Offset Against Collateral Derivative, Collateral, Right to Reclaim Cash Derivative, Collateral, Right to Reclaim Cash Derivative, Collateral, Master Netting Arrangements, Letters of Credit Derivative, Collateral, Master Netting Arrangements, Letters of Credit The amount of collateral posted pursuant to derivative instruments with counterparties where a master netting arrangement exists, consisting of letters of credit. Net gain or loss recognized in the statement of income offset by regulatory accounting Net gain or loss recognized in the statement of income offset by regulatory accounting Net gain or loss recognized in the statement of income for derivative instruments related to price risk management activities offset by regulatory accounting. Derivative, Net Liability Position, Aggregate Fair Value Derivative, Net Liability Position, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Collateral Aggregate Fair Value Collateral Aggregate Fair Value The aggregate fair value of assets that would be required to be posted as collateral for derviative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. Margin Deposit Assets Deposit Assets Balance Sheet Components [Abstract] Balance Sheet Components [Abstract] Balance Sheet Components Details of Certain Balance Sheet Accounts Disclosure [Text Block] Details of Certain Balance Sheet Accounts Commitments and Contingencies Disclosure [Abstract] Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unrecorded Unconditional Purchase Obligation [Line Items] Unrecorded Unconditional Purchase Obligation [Line Items] Other Commitment Other Commitment Long-term Contract for Purchase of Electric Power, Estimated Annual Cost Other Commitment, Due in Next Twelve Months Other Commitment, Due in Second Year Other Commitment, Due in Second Year Other Commitment, Due in Third Year Other Commitment, Due in Third Year Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments Receivable, in Three Years percentage of output Maximum percentage of output possibley allocated Cumulative maximum percentage of defaulting purchasers output that PGE would be allocated. Contractual Obligation Contractual Obligation Operating Leases, Rent Expense Operating Leases, Rent Expense Operating Leases, Future Minimum Payments Receivable, Current Operating Leases, Future Minimum Payments Receivable, Current Operating Leases, Future Minimum Payments Receivable, in Two Years Operating Leases, Future Minimum Payments Receivable, in Two Years Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Five Years Operating Leases, Future Minimum Payments Receivable, in Five Years Operating Leases, Rent Expense, Sublease Rentals Operating Leases, Rent Expense, Sublease Rentals Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years Operating Leases, Future Minimum Payments Receivable, in Four Years Statement, Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Revenues, net Electric Revenue Operating expenses: Costs and Expenses [Abstract] Purchased power and fuel Cost of Purchased Power Generation, transmission and distribution Electric Production Expense Cascade Crossing transmission project Expenses related to Cascade Crossing Expenses related to Cascade Crossing Administrative and other General and Administrative Expense Depreciation and amortization Depreciation, Depletion and Amortization Taxes other than income taxes Taxes, Miscellaneous Total operating expenses Costs and Expenses Income from operations Operating Income (Loss) Interest expense, net Interest Expense Other income: Other Income and Expenses [Abstract] Allowance for equity funds used during construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Miscellaneous income, net Other Nonoperating Income (Expense) Other income, net Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Less: net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to Portland General Electric Company Net Income (Loss) Attributable to Parent Weighted-average shares outstanding (in thousands): Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Earnings per share: Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Schedule of allocation of plan assets [Table] schedule of allocation of plan assets [Table] schedule of allocation of plan assets [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Pension Plan [Member] Other Pension Plan [Member] Other Postretirement Benefit Plans [Member] Other Postretirement Benefit Plan [Member] Non Qualified Benefit Plans [Member] Other Pension Plan, Postretirement or Supplemental Plans [Member] Defined Benefit Plan by Plan Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Equity [Member] Equity Securities [Member] Debt Securities [Member] Debt Securities [Member] Other Contract [Member] Other Contract [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan, Target Plan Asset Allocations Defined Benefit Plan, Target Plan Asset Allocations Defined Benefit Plan, Actual Plan Asset Allocations Defined Benefit Plan, Actual Plan Asset Allocations Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Net realized losses net realized losses net realized losses on price risk management Long-term Debt, Fair Value Long-term Debt, Fair Value Long-term Debt Long-term Debt Defined Benefit Plan, Transfers Between Measurement Levels Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Variable interest Entities [Abstract] Variable interest Entities [Abstract] Entities [Table] Entities [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Entity Information [Line Items] Entity Information [Line Items] Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions Estimated Remaining Useful Life of Facility Acquired Estimated Remaining Useful Life of Facility Acquired Estimated useful life expected to be remaining at the date of purchase in a future period. Fair Value of Financial Instruments Note [Abstract] Fair value of financial instruments note. Fair Value of FInancial Instruments Fair Value Disclosures [Text Block] Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Regulatory Liability [Axis] Regulatory Liability [Axis] Regulatory Liability [Domain] Regulatory Liability [Domain] Noncurrent Regulatory Liabilities [Member] Noncurrent Regulatory Liabilities [Member] Noncurrent Regulatory Liabilities Noncurrent Regulatory Assets [Member] Noncurrent Regulatory Assets [Member] Noncurrent Regulatory Assets Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Type of Arrangement [Member] Type of Arrangement [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Other Investments Other Investments Business days after the invoice date Business days after the invoice date Business days after the invoice date Days after the due date Days after the due date Days after the due date Wholesale accounts receivable written off Wholesale accounts receivable written off Wholesale accounts receivable written off Margin deposit Margin Deposit Assets Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Expenses related to Cascade Crossing Public Utilities, Allowance for Funds Used During Construction, Rate Public Utilities, Allowance for Funds Used During Construction, Rate Public Utilities, Allowance for Funds Used During Construction, Capitalized Interest Allowance for Funds Used During Construction, Capitalized Interest Construction in Progress, Gross Construction in Progress, Gross Public Utilities, Allowance for Funds Used During Construction, Additions Public Utilities, Allowance for Funds Used During Construction, Additions Public Utilities, Property, Plant and Equipment, Construction Work in Progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Malpractice Loss Contingency, Letters of Credit and Surety Bonds Malpractice Loss Contingency, Letters of Credit and Surety Bonds Depreciation expense rate Depreciation expense rate Depreciation expense rate as a percent of the related average depreciable plant in service. Asset Retirement Removal Costs Included in Depreciation Expense asset retirement removal costs included in depreciation expense asset retirement removal costs included in depreciation expense Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Amortization of Intangible Assets Amortization of Intangible Assets Future Amortization Expense, Year One Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Future Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Two Future Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Three Future Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Four Future Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, Year Five Power Cost Deadband - Lower Threshold Power Cost Deadband - Lower Threshold Lower threshold of the net variable power cost deadband as established under the Company's annual update tariff. Power Cost Deadband - Upper Threshold Power Cost Deadband - Upper Threshold Upper threshold of the net variable power cost deadband established under the Company's annual update tariff. Public Utilities, Approved Return on Equity, Percentage Public Utilities, Approved Return on Equity, Percentage Asset Retirement Obligations, Noncurrent Asset Retirement Obligations, Noncurrent Franchise taxes Franchise taxes Franchise taxes collected from customers and remitted to local taxing jurisdictions. Deferred Tax Assets, Regulatory Assets and Liabilities Deferred Tax Assets, Regulatory Assets and Liabilities Jointly-owned Plant [Abstract] Jointly-owned Plant [Abstract] Schedule of Jointly Owned Utility Plants [Table Text Block] Schedule of Jointly Owned Utility Plants [Table Text Block] Long-term Debt, Unclassified [Abstract] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Allocation of Financial Asset to Hierarchy Levels [Policy Text Block] Allocation of Financial Asset to Hierarchy Levels [Policy Text Block] Allocation of Financial Asset to Hierarchy Levels [Policy Text Block] Transfers in and out of Level 3 [Policy Text Block] Transfers in and out of Level 3 [Policy Text Block] Transfers in and out of Level 3 of the Fair Value Hierarchy [Policy Text Block] Debt, Policy [Policy Text Block] Debt, Policy [Policy Text Block] VariableInterestEntities [Text Block] VariableInterestEntities [Text Block] VariableInterestEntities [Text Block] Credit Facilities Revolving Credit Facilities [Text Block] Revolving Credit Facilities [Text Block] Gross Reporting of Positive and Negative Exposures Related to Derivative Instruments [Policy Text Block] Gross Reporting of Positive and Negative Exposures Related to Derivative Instruments [Policy Text Block] The company elects to report gross on the balance sheet the positive and negative exposures resultinig from derivative instruments. Balance Sheet Location [Axis] Balance Sheet Location [Domain] Derivatives, Fair Value [Line Items] Current assets: Assets, Current [Abstract] Current Assets, Commodity Contracts: Current Assets, Commodity Contracts: [Abstract] Commodity contracts: [Abstract] Electricity Commodity Contract Asset, Current, Electricity Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to electricity which are expected to be settled within a year or normal operating cycle, if longer. Natural Gas Commodity Contract Asset, Current, Natural Gas Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to natural gas which are expected to be settled within a year or normal operating cycle, if longer. Total current derivative assets Current Derivative Assets Fair valules as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be settled within one year or the normal operating cycle, if longer. Noncurrent assets: Assets, Noncurrent [Abstract] Noncurrent Assets, Commodity Contracts: [Abstract] Noncurrent Assets, Commodity Contracts: [Abstract] Noncurrent Assets, Commodity Contracts: [Abstract] Commodity Contract Asset, Noncurrent, Electricity Commodity Contract Asset, Noncurrent, Electricity Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to electricity which are expected to be settled after a year or beyond the normal operating cycle, if longer. Derivative Asset, Noncurrent Derivative Asset, Noncurrent Total derivative assets not designated as hedging instruments Price Risk Derivative Instruments Not Designated as Hedging Instruments Asset, at Fair Value Total derivative assets Derivative Assets, Total Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments. Current liabilities: Liabilities, Current [Abstract] Current Liabilities, Commodity Contracts: [Abstract] Current Liabilities, Commodity Contracts: [Abstract] Current Liabilities, Commodity Contracts: [Abstract] Electricity Commodity Contract Liability, Current, Electricity Carrying amount as of the balance sheet date of the liability arising from commodity contracts related to electricity which are expected to be settled within a year or the normal operating cycle, if longer. Natural Gas Commodity Contract Liability, Current, Natural Gas Carrying amount as of the balance sheet date of the liability arising from the commodity contracts related to natural gas which are expected to be settled within a year or normal operating cycle, if longer. Total current derivative liabilities Current Derivative Liabilities Fair values as of the balance sheet date for all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be settled within one year of the normal operating cycle, if longer. Liabilities, Noncurrent [Abstract] Liabilities, Noncurrent [Abstract] Noncurrent Liabilities, Commodity Contracts: [Abstract] Noncurrent Liabilities, Commodity Contracts: [Abstract] Noncurrent Liabilities, Commodity Contracts: [Abstract] Electricity Commodity Contract Liability, Noncurrent, Electricity Carrying amount as of the balance sheet date of the liability arising from commodity contracts related to electricity which are expected to be settled after a year or beyond the normal operating cycle, if longer. Natural Gas Commodity Contract Liability, Noncurrent, Natural Gas Carrying amount as of the balance sheet date of the liability arising from commodity contracts related to natural gas which are expected to be settled after a year or beyond the normal operating cycle, if longer. Total noncurrent derivative liabilities Noncurrent Derivative Liabilities Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be settled after one year or normal operating cycle, if longer. Total derivative liabilities not designated as hedging instruments Price Risk Derivative Instruments Not Designated as Hedging Instruments Liability, at Fair Value Total derivative liabilities Derivative Liabilities, Total Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State and local Current State and Local Tax Expense (Benefit) Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Deferred: Deferred: [Abstract] Deferred: [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State and local Deferred State and Local Income Tax Expense (Benefit) deferred income tax expense deferred income tax expense - footnote deferred income tax expense - footnote Income tax expense Contingencies [Abstract] Contingencies [Abstract] Commitments and Contingencies, Policy [Policy Text Block] Commitments and Contingencies, Policy [Policy Text Block] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Asset Retirement Obligation Asset Retirement Obligation, Liabilities Incurred Asset Retirement Obligation, Liabilities Incurred Asset Retirement Obligation, Liabilities Settled Asset Retirement Obligation, Liabilities Settled Asset Retirement Obligation, Accretion Expense Asset Retirement Obligation, Accretion Expense Asset Retirement Obligation, Revision of Estimate Asset Retirement Obligation, Revision of Estimate Asset Retirement Obligation Fair Value Disclosures [Abstract] Fair Value, Option, Quantitative Disclosures [Table] Fair Value, Option, Quantitative Disclosures [Table] Eligible Item or Group for Fair Value Option [Axis] Eligible Item or Group for Fair Value Option [Axis] Fair Value, Option, Eligible Item or Group [Domain] Fair Value, Option, Eligible Item or Group [Domain] Assets [Member] Available-for-sale Securities [Member] Liabilities [Member] Derivative Financial Instruments, Liabilities [Member] Weighted Average [Member] Weighted Average [Member] Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Electricity physical forward purchase Electricity physical forward purchase Electricity physical forward purchase Natural gas financial swaps Natural gas financial swaps Natural gas financial swaps Fnancial swaps - electricity Fnancial swaps - electricity Fnancial swaps - electricity Total commodity contracts Total commodity contracts Total commodity contracts Investments held in trust [Table] Investments held in trust [Table] Investments held in trust [Table] Trust [Axis] Trust [Axis] Trust Investments [Axis] Trust [Domain] Trust [Domain] Trust [Domain] Nuclear Decommissioning [Member] Nuclear Decommissioning [Member] Nuclear Decommissioning Turst [Member] Non Qualified Benefit Plans [Member] Non Qualified Benefit Plans [Member] Non Qualified Benefit Plans [Member] Cash equivalents Cash Equivalents, at Carrying Value Marketable securities, at fair value: Marketable Securities [Abstract] Equity securities Marketable Securities, Equity Securities Debt securities Available-for-sale Securities, Debt Securities Insurance contracts, at cash surrender value Cash Surrender Value, Fair Value Disclosure Decommissioning Fund Investments, Fair Value Decommissioning Fund Investments, Fair Value Non-qualified benefit plan trust Assets Held-in-trust, Noncurrent Contingencies [Text Block] Contingencies [Text Block] Includes disclosure of contingencies. This element may be used as a single block of text to encapsulate the entire disclosure including data and tables. Long-term Debt Disclosure [Abstract] Long-term Debt Disclosure [Abstract] Long-term Debt Long-term Debt [Text Block] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Tax Credit Carryforward, Federal Tax Credit Carryforward, Federal The amount of the federal tax credit carryforward, berfore tax effects, available to reduce future taxable income under enacted tax laws. Tax Credit Carryforward, State Tax Credit Carryforward, State The amount of the state tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Valuation Allowance Unrecognized Tax Benefits Unrecognized Tax Benefits Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Unrealized Gain Loss On Derivatives [Member] Unrealized Gain Loss On Derivatives [Member] Unrealized Gain Loss On Derivatives [Member] Commodity contracts: Unrealized Gain (Loss) on Derivatives and Commodity Contracts [Abstract] Other Commitment, Due in Next Twelve Months Other Commitment, Due in Fourth Year Other Commitment, Due in Fourth Year Other Commitment, Due in Fifth Year Other Commitment, Due in Fifth Year Other Commitment, Due after Fifth Year Other Commitment, Due after Fifth Year Total Statement of Comprehensive Income [Abstract] Net Taxes on change in compensation retirement benefits liability and amortization Net Taxes on change in compensation retirement benefits liability and amortization Net Taxes on change in compensation retirement benefits liability and amortization Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Money market funds Money Market Funds, at Carrying Value Domestic government, Debt securities US Government Securities, at Carrying Value Corporate debt securities held in decommissioning trust assets Corporate debt securities held in decommissioning trust assets Corporate debt securities held in decommissioning trust assets Fair Value - Money market funds Fair Value - Money market funds Fair Value - Money market funds Domestic Equity Securities Domestic Equity Securities Domestic Equity Securities International Equity Securities International equity securities International equity securities Debt securities - domestic government debt securities - domestic government debt securities - domestic government Electricity Commodity Contract Asset, Electricity Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to purchases or sales of electricity. Natural gas Commodity Contract Asset, Natural gas Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to purchases or sales of natural gas. Financial Instruments, Owned, at Fair Value Financial Instruments, Owned, at Fair Value Liabilities from price risk management activities: [Abstract] Liabilities from price risk management activities: [Abstract] Liabilities from price risk management activities: [Abstract] Electricity Commodity Contract Liabilities, Electricity Carrying amount as of the balance sheet date of the liabilities arising from commodity contracts related to purchases or sales of electricity. Natural gas Commodity Contract Liabilities, Natural gas Carrying amount as of the balance sheet date of the liabilities arising from commodity contracts related to purchases or sales of natural gas. Liabilities, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Jointly-owned Plant [Text Block] Jointly-owned Plant [Text Block] Jointly-owned Plant [Text Block] Property, Plant and Equipment, Type [Axis] Jointly Owned Electricity Generation Plant [Member] Jointly Owned Electricity Generation Plant [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Allowance for Doubtful Accounts Receivable, Current Allowance for Doubtful Accounts Receivable, Current Loss Contingency, Damages Awarded, Value Loss Contingency, Damages Awarded, Value Deferred income tax assets: Deferred Tax Assets, Net [Abstract] Employee benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits Price risk management Deferred Tax Assets, Price risk management The tax effect as of the balance sheet date of the amount of estimated future tax deductions arising from net liabilities from price risk management activities. Deferred income taxes Deferred Tax Assets, tax credits, net of valuation allowance Deferred Tax Assets, tax credits, net of valuation allowance The sum of the tax effects as of the balance sheet date of the amount of tax credits available for future use, net of any valuation allowance. Deferred Tax Assets, Tax Deferred Expense, Other Deferred Tax Assets, Tax Deferred Expense, Other Total deferred income tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred income tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Depreciation and amortization Deferred Tax Liabilities, Property, Plant and Equipment Regulatory assets Deferred Tax Liabilities, Regulatory Assets Deferred Tax Liabilities, Other Deferred Tax Liabilities, Other Deferred Tax Liabilities, Gross, Noncurrent Deferred Tax Liabilities, Gross, Noncurrent Total deferred income tax liabilities Deferred Tax Liabilities, Net Classification of net deferred income taxes: Deferred Tax Assets, Net, Classification [Abstract] Current deferred income tax asset Deferred Tax Assets, Net of Valuation Allowance, Current Noncurrent deferred income tax liability Deferred Tax Liabilities, Net, Noncurrent Asset Retirement Obligation [Abstract] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Pension Plan assets: Defined Benefit Plan, Funded Status of Plan [Abstract] Money market funds Money market funds - defined benefit pension plan assets Money market funds - defined benefit pension plan assets Equity securities: Equity securities: [Abstract] Equity securities: [Abstract] Domestic Domestic equity securities - defined benefit pension plan assets Domestic equity securities - defined benefit pension plan assets International equity securities - defined benefit pension plan assets International equity securities - defined benefit pension plan assets International equity securities - defined benefit pension plan assets Debt securities: Debt securities: [Abstract] Debt securities: [Abstract] Domestic government and corporate credit Domestic government and corporate credit defined benefit pension plan assets Domestic government and corporate credit defined benefit pension plan assets Private equity funds Private equity funds Private equity fund securities held in Defined Benefit Pension Plan assets Defined Benefit Plan, Fair Value of Plan Assets Defined Benefit Plan, Fair Value of Plan Assets Other Postretirement Benefit Plans assets: [Abstract] Other Postretirement Benefit Plans assets: [Abstract] Other Postretirement Benefit Plans assets: [Abstract] Money market funds Fair Value of Money market funds - other post retirement benefit plan assets at fair value Money market funds - other post retirement benefit plan assets at fair value Domestic equity securities - Other postretirement benefit plan assets at fair value Domestic equity securities - Other postretirement benefit plan assets at fair value Domestic equity securities - Other postretirement benefit plan assets at fair value International equity securities - other post retirement assets at fair value International equity securities - other post retirement assets at fair value International equity securities - other post retirement assets at fair value Debt securities—Domestic government Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets Debt securities—Domestic Government Other Postretirement Benefit Plan Assets Other post retirement benefit plan assets total other post retirement benefit plan assets total other post retirement benefit plan assets total Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures [Abstract] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Utility Plant [Domain] Utility Plant [Domain] Asset Retirement Obligation, Revision of Estimate Damages sought in USDOE claim Damages sought in USDOE claim Damages sought in USDOE claim Asset Retirement Obligation Rate Recovery related to Trojan Plant Asset Retirement Obligation Rate Recovery related to Trojan Plant Asset Retirement Obligation Rate Recovery related to Trojan Plant Proceeds from Decommissioning Trust Fund Assets Proceeds from Decommissioning Trust Fund Assets Asset Retirement Obligation, Period Increase (Decrease) Asset Retirement Obligation, Period Increase (Decrease) Asset Retirement Obligations, Significant Changes Asset Retirement Obligations, Significant Changes Equity Securities by Industry [Axis] Industry Sector [Axis] Equity Securities, Industry [Domain] Industry Sector [Domain] Equity Securities by Entity Size [Axis] Equity Securities by Entity Size [Axis] Equity Securities, Entity Size [Domain] Equity Securities, Entity Size [Domain] Equity Securities by Investment Objective [Axis] Equity Securities by Investment Objective [Axis] Equity Securities, Investment Objective [Domain] Equity Securities, Investment Objective [Domain] Fair Value Hierarchy [Domain] Pension Contributions Pension Contributions Defined Benefit Plan, Benefits Paid Defined Benefit Plan, Benefits Paid Contribution to health reimbursement account - sick time contribution to health reimbursement account - sick time Contributions to the HRAs provide for claims by retirees for qualified medical costs. For active bargaining employees, the participants’ accounts are credited with 58% of the value of the employee’s accumulated sick time as of April 30, 2004. Contribution to health reimbursement account - earned time off contribution to health reimbursement account - earned time off Contributions to the HRAs provide for claims by retirees for qualified medical costs. For active bargaining employees, the participants’ accounts are credited with 100% of their earned time off accumulated at the time of retirement. OtherPostretirementDefinedBenefitPlanLiabilityCurrent OtherPostretirementDefinedBenefitPlanLiabilityCurrent This represents the current liability recognized in the balance sheet that is associated with other postretirement defined benefit plans (excluding pension plans). Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year Net actuarial loss portion of amortization from AOCL for pension benefits net actuarial loss portion of amortization from AOCL for pension benefits The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented related to the net actuarial loss for pension benefits. Net Actuarial Loss Portion of Amortization from AOCL for Non-qualified benefits Net Actuarial Loss Portion of Amortization from AOCL for Non-qualified benefits The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, consisting of the net actuarial loss for non-qualified benefits. Net actuarial loss portion of amortiztion of AOCL for other postretirement benefits Net actuarial loss portion of amortiztion of AOCL for other postretirement benefits The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, consisting of the net actuarial loss for other postretiremnt benefits. Defined benefit plan, current annual rate of health care cost increase Defined benefit plan, current annual rate of health care cost increase The assumed health care cost trend rate for the current year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Company match pre 2009 hire Company match pre 2009 hire Company match, percentage of participating employee's base salary for employees hired pre February 1, 2009. Company match post 2008 hire Company match post 2008 hire Company match, percentage of participating employee's base salary for employees hired post January 31, 2009. Company contribution percentage to 401k for post 2008 hires Company contribution percentage to 401k for post 2008 hires Company contribution percentage of participating employee's base salary for employees hired post January 31, 2009, regardless of whether the employee contributes to the 401k plan. Company contribution percent to 401k for bargaining employees Company contribution percent to 401k for bargaining employees For bargaining employees, who are subject to the International Brotherhood of Electrical Workers Local 125 agreements, the Company contributes a stated amount per compensable hour plus this percentage of the employee’s base salary, whether or not the employee contributes to the 401k Plan. 401k Plan Company contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facitlity, Covenant Terms, One Month Term Line of Credit Facitlity, Covenant Terms, One Month Term Line of Credit Facitlity, Covenant Terms, One Month Term Line of Credit Facitlity, Covenant Terms, Two Month Term Line of Credit Facitlity, Covenant Terms, Two Month Term Line of Credit Facitlity, Covenant Terms, Two Month Term Line of Credit Facitlity, Covenant Terms, Three Month Term Line of Credit Facitlity, Covenant Terms, Three Month Term Line of Credit Facitlity, Covenant Terms, Three Month Term Line of Credit Facitlity, Covenant Terms, Six Month Term Line of Credit Facitlity, Covenant Terms, Six Month Term Line of Credit Facitlity, Covenant Terms, Six Month Term Debt Instrument, Covenant Description Debt Instrument, Covenant Description Ratio of Indebtedness to Net Capital Ratio of Indebtedness to Net Capital Commercial Paper, Maximum Term Commercial Paper, Maximum Term Commercial Paper, Maximum Term Commercial Paper Commercial Paper FERC Authorized Short-term Debt, effective through February 6, 2014 FERC Authorized Short-term Debt, effective through February 6, 2014 FERC Authorized Short-term Debt, effective through February 6, 2014 Line of Credit Facility, Amount Outstanding Long-term Line of Credit Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity letter of credit facility letter of credit facility letter of credit facility Letters of Credit Outstanding, Amount Pledged Financial Instruments, Not Separately Reported, Securities for Letter of Credit Facilities Statement, Equity Components [Axis] Common Stock Shares Common Stock [Member] Common Stock Amount Common Stock Including Additional Paid in Capital [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Retained Earnings Retained Earnings [Member] Noncontrolling Interests' Equity Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, shares Shares, Issued Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Issuances of common stock, net of issuance costs Stock Issued During Period, Shares, New Issues Issuances of common stock, net of issuance costs Stock Issued During Period, Value, New Issues Shares issued pursuant to equity-based plans Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Proceeds from issuance of shares pursuant to equity-based plans Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Stock-based compensation Stock Granted, Value, Share-based Compensation, Net of Forfeitures Dividends declared Dividends, Common Stock Net income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Balance, shares Balance Assets and Liabilites associated with Non-qualified Benefit Plans [Table] Assets and Liabilites associated with Non-qualified Benefit Plans [Table] Assets and Liabilites associated with Non-qualified Benefit Plans [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis] Other Postretirement Benefit Plans [Domain] Defined Benefit Pension Plan [Member] Total Non-qualified benefit plan trust assets [Domain] United States Postretirement Benefit Plan of US Entity [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Non-qualified benefit plan trust Non-qualified benefit plan liabilities Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent Equity Based Plans [Abstract] Employee stock purchase plans [Abstract] Stock Purchase Plan [Text Block] Stock Purchase Plan [Text Block] Stock Purchase Plan Text Block Trojan decommissioning activities Trojan decommissioning activities Asset retirement obligation related to Trojan decommissioning activities Utility plant Asset Retirement Obligation - Utility Plant Asset Retirement Obligation - Utility Plant Non-utility property Asset Retirement Obligation - Non-utility property Asset Retirement Obligation - Non-utility property Asset Retirement Obligation stock offering stock offering Public stock offering Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plan, Fair Value of Plan Assets Unrealized gain on assets Unrealized Gain (Loss) on Investments Available-for-sale Securities, Gross Realized Gain (Loss) Available-for-sale Securities, Gross Realized Gain (Loss) Purchases and sales, net Defined benefit plan, purchases and sales, net Defined benefit plan, purchases and sales, net Employee Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Price Risk Derivatives [Table Text Block] Schedule of Price Risk Derivatives [Table Text Block] Schedule of Concentration of Risk, by Counterparty [Table Text Block] Schedule of Concentration of Risk, by Counterparty [Table Text Block] Tabular disclosure of counterparties representing 10% or more of assets and liabilities from price risk management activities recorded in the reporting entity's statement of financial position. Production, excluding thermal: Production, excluding thermal: [Abstract] Production plant, excluding thermal: [Abstract] Hydro estimated average service life - hydro production plant estimated average service life - hydro production plant Wind estimated average service life - wind production plant estimated average service life - wind production plant Transmission estimated average service lives - transmission plant estimated average service lives - transmission plant Distribution estimated average service lives - distribution plant estimated average service lives - distribution plant General estimated average service lives - general plant estimated average service lives - general plant Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Trade and Other Accounts Receivable, Policy [Policy Text Block] Trade and Other Accounts Receivable, Policy [Policy Text Block] Derivatives, Policy [Policy Text Block] Derivatives, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Inventory, Policy [Policy Text Block] Inventory, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Allowance for Funds Used During Construction, Policy [Policy Text Block] Allowance for Funds Used During Construction, Policy [Policy Text Block] Regulatory Depreciation and Amortization, Policy [Policy Text Block] Regulatory Depreciation and Amortization, Policy [Policy Text Block] Depreciation Lives [Policy Text Block] depreciation lives [Policy Text Block] depreciation lives [Policy Text Block] Plant Retirement and Abandonment, Policy [Policy Text Block] Plant Retirement and Abandonment, Policy [Policy Text Block] Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Marketable Securities, Policy [Policy Text Block] Marketable Securities, Policy [Policy Text Block] Public Utilities, Policy [Policy Text Block] Public Utilities, Policy [Policy Text Block] Power Cost [Policy Text Block] power cost [Policy Text Block] power cost, including the application of the power cost adjustment mechanism (PCAM) [Policy Text Block] Asset Retirement Obligations, Policy [Policy Text Block] Asset Retirement Obligations, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Franchise Tax [Policy Text Block] franchise tax [Policy Text Block] franchise tax [Policy Text Block] Trade and Other Accounts Receivable, Unbilled Receivables, Policy [Policy Text Block] Trade and Other Accounts Receivable, Unbilled Receivables, Policy [Policy Text Block] Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Income Tax Uncertainties, Policy [Policy Text Block] Income Tax Uncertainties, Policy [Policy Text Block] Interest and Penalties Related to Income Taxes [Policy Text Block] interest and penalties related to income taxes [Policy Text Block] interest and penalties related to income taxes [Policy Text Block] Price Risk Management Derivative Instruments and Hedging Activities Disclosure [Text Block] ASSETS Assets [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net Accounts Receivable, Net, Current Unbilled revenues Unbilled Revenue Carrying amount at the balance sheet date of revenues which have been earned but not yet billed. Inventories, at average cost: Energy Related Inventory [Abstract] Materials and supplies Other Inventory, Supplies, Gross Fuel Energy Related Inventory Regulatory assets--current Regulatory Assets, Current Other current assets Other Assets, Current Total current assets Assets, Current Electric utility plant: Public Utilities, Property, Plant and Equipment, Net [Abstract] Generation Public Utilities, Property, Plant and Equipment, Generation or Processing Transmission Public Utilities, Property, Plant and Equipment, Transmission Distribution Public Utilities, Property, Plant and Equipment, Distribution General Public Utilities, Property, Plant and Equipment, General Public Utilities, Property, Plant and Equipment, General Intangible Public Utilities, Property, Plant and Equipment, Intangible Public Utilities, Property, Plant and Equipment, Intangible Construction work-in-progress Total electric utility plant Public Utilities, Property, Plant and Equipment, Plant in Service Accumulated depreciation and amortization Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Electric utility plant, net Public Utilities, Property, Plant and Equipment, Net Regulatory assets--noncurrent Regulatory Assets, Noncurrent Nuclear decommissioning trust Other noncurrent assets Other Assets, Noncurrent Total assets Assets Liabilities and Equity [Abstract] Liabilities and Equity [Abstract] Accounts payable Accounts Payable and Accrued Liabilities, Current Liabilities from price risk management activities-current Derivative Liability, Current Short-term debt Current portion of long-term debt Long-term Debt, Current Maturities Accrued expenses and other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Long-term debt, net of current portion Long-term Debt, Excluding Current Maturities Regulatory liabilities--noncurrent Regulatory Liability, Noncurrent Deferred income taxes Unfunded status of pension and postretirement plans Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent Liabilities from price risk management activities--noncurrent Derivative Liability, Noncurrent Asset retirement obligations Other noncurrent liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and Contingencies (see notes) Commitments and Contingencies Equity: Equity [Abstract] Portland General Electric Company shareholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, no par value, 30,000,000 shares authorized; none issued and outstanding Preferred Stock, Value, Issued Common stock, no par value, 160,000,000 shares authorized; 88,792,751 and 78,228,339 shares issued and outstanding as of December 31, 2015 and 2014, respectively Common Stock, Value, Issued Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Total equity Total liabilities and equity Liabilities and Equity Schedule of Short-term Debt [Table Text Block] Schedule of Short-term Debt [Table Text Block] Commitments and Guarantees [Text Block] Commitments and Guarantees [Text Block] Commitments and Guarantees Text Block Basis of Presentation [Abstract] Basis of Presentation [Abstract] Consolidation, Policy [Policy Text Block] Consolidation, Policy [Policy Text Block] Statement of Financial Position [Abstract] Scenario [Axis] Preferred Stock, No Par Value Preferred Stock, No Par Value Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Common Stock, No Par Value Common Stock, No Par Value Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Other current assets: Other current assets: [Abstract] Other current assets: [Abstract] Prepaid Expense, Current Prepaid Expense, Current Current deferred income tax asset accrued sales tax refund accrued sales tax refund Accrued sales tax refund related to wind farm. Margin Deposit Assets Assets from price risk management activities Regulatory assets from price risk management activities Regulatory assets from price risk management activities Other Other Assets, Miscellaneous Other Assets, Current Accrued expenses and other current liabilities: Accrued expenses and other current liabilities: [Abstract] Accrued expenses and other current liabilities: [Abstract] Regulatory Liability, Current Regulatory Liability, Current Accrued employee compensation and benefits Employee-related Liabilities, Current Accrued interest payable Interest Payable, Current Dividends payable Dividends Payable, Current Taxes Payable, Current Taxes Payable, Current Other Other Current Liabilities - Other Other Current Liabilities - Other Other Liabilities, Current Lointly-owned plant [Abstract] Lointly-owned plant [Abstract] Jointly Owned Utility Plant Interests [Table] Jointly Owned Utility Plant Interests [Table] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant Interests [Line Items] Jointly Owned Utility Plant Interests [Line Items] Jointly Owned Utility Plant, Proportionate Ownership Share of Boardman Jointly Owned Utility Plant, Proportionate Ownership Share of Boardman The proportionate share of the reporting entity's interest (percent) in Boardman, a jointly owned utility plant. Jointly Owned Plant, Boardman Plant In Service Year Jointly Owned Plant, Boardman Plant In Service Year Jointly Owned Plant, Boardman Plant In Service Year Jointly Owned Utility Plant, Gross Ownership Amount of Boardman Plant In Service Jointly Owned Utility Plant, Gross Ownership Amount of Boardman Plant In Service The period end amount owned by the reporting entity of a jointly owned utility (Boardman) plant in service. Jointly Owned Utility Plant, Ownership Amount of Boardman Plant Accumulated Depreciation Jointly Owned Utility Plant, Ownership Amount of Boardman Plant Accumulated Depreciation The period end amount owned by the reporting entity of a jointly owned electricity generating facility (Boardman) plant accumulated depreciation. Jointly Owned Utility Plant Ownership Amount of Construction Work In Progress Boardman Jointly Owned Utility Plant Ownership Amount of Construction Work In Progress Boardman The reporting entity's period end amount of construction work in progress at Boardman, a jointly owned electricity generation plant. Jointly Owned Utility Plant, Proportionate Ownership Share of Colstrip Jointly Owned Utility Plant, Proportionate Ownership Share of Colstrip The proportionate share of the reporting entity's interest (percent) in Colstrip, a jointly owned utility plant. Jointly Owned Plant, Colstrip Plant In Service Year Jointly Owned Plant, Colstrip Plant In Service Year Jointly Owned Plant, Colstrip Plant In Service Year Jointly Owned Utility Plant, Gross Ownership Amount of Colstrip Plant In Service Jointly Owned Utility Plant, Gross Ownership Amount of Colstrip Plant In Service The period end amount owned by the reporting entity of a jointly owned utility (Colstrip) plant in service. Jointly Owned Utility Plant, Ownership Amount of Colstrip Plant Accumulated Depreciation Jointly Owned Utility Plant, Ownership Amount of Colstrip Plant Accumulated Depreciation The period end amount owned by the reporting entity of a jointly owned electricity generating facility (Colstrip) plant accumulated depreciation. Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress Colstrip Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress Colstrip The reporting entity's period end amount of construction work in progress at Colstrip, a jointly owned electricity generation plant. Jointly Owned Utility Plant, Proportionate Ownership Share of Pelton/Round Butte Jointly Owned Utility Plant, Proportionate Ownership Share of PeltonRound Butte The reporting entity's interest (percent) in Pelton/Round/Butte, a jointly owned utility plant. Jointly Owned Plant, Pelton Plant in Service Year Jointly Owned Plant, Pelton in Service Year Jointly Owned Plant, Pelton in Service Year Jointly Owned Plant, Round Butte in Service Year Jointly Owned Plant, Round Butte in Service Year Jointly Owned Plant, Round Butte in Service Year Jointly Owned Utility Plant, Gross Ownership Amount of Pelton/Round Butte Plant In Service Jointly Owned Utility Plant, Gross Ownership Amount of PeltonRound Butte Plant In Service The period end amount owned by the reporting entity of utility plant (Pelton/Round Butte) plant in service. Jointly Owned Utility Plant, Ownership Amount of Pelton/Round Butte Plant Accumulated Depreciation Jointly Owned Utility Plant, Ownership Amount of PeltonRound Butte Plant Accumulated Depreciation The period end amount owned by the reporting entity of a jointly owned electricity generating facility (Pelton/Round Butte) plant accumulated depreciation. Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress Pelton/Round Butte Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress PeltonRound Butte The reporting entity's period end amount of construction work in progress at Pelton/Round Butte, a jointly owned electricity generation plant. Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress Regulatory Assets and Liabilities [Abstract] Regulatory Assets and Liabilities [Abstract] Regulatory Assets, Current [Member] Regulatory Assets, Current [Member] Current Regulatory Assets Current Regulatory Liabilities [Member] Current Regulatory Liabilities [Member] Current Regulatory Liabilities Remaining Recovery Period of Regulatory Assets, Price Risk Management Remaining Recovery Period of Regulatory Assets, Price Risk Management Remaining recovery period of regulatory assets, Price Risk Management, for which no return on investment during recovery period is provided. Remaining Recovery Period of Regulatory Asset, Debt Reacquisition Costs Remaining Recovery Period of Regulatory Asset, Debt Issuance Costs Remaining Recovery Period of Regulatory Asset, Debt Issuance Costs Price risk management Pension and other postretirement plans Defined Benefit Plan, Assets for Plan Benefits, Noncurrent Debt reacquisition costs Deferred Finance Costs, Net remaining recovery period of regulatory assets, deferred capital projects remaining recovery period of regulatory assets, deferred capital projects remaining recovery period of regulatory assets, deferred capital projects Deferred capital project Deferred capital project Deferred capital project. Other Other Deferred Costs, Net Total regulatory assets Regulatory Assets Asset retirement removal costs Asset retirement removal cost Asset retirement removal costs. Remaining refund period of regulatory liability, Trojan decommissioning activities Remaining refund period of regulatory liability, Trojan decommissioning activities Remaining refund period of regulatory liability, Trojan decommissioning activities Proceeds from Legal Settlements regulatory liabilities - trojan decommissioning trust regulatory liabilities - Amounts held in trojan decommissioning trust that is to be returned to customers in future rate proceedings. Asset retirement obligations Other Regulatory liabilities - Other Other regulatory liabilities. Total regulatory liabilities Regulatory Liabilities Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Concentration Risk [Line Items] Concentration Risk [Line Items] Assets from price risk management activities: Assets from price risk management activities: [Abstract] Assets from price risk management activities: [Abstract] Counterparty A Counterparty-A Individually significant counterparty of total assets arising from derivative instruments from price risk management activities. Counterparty B Counterparty B Individually significant counterparty of total assets arising from derivative instruments from price risk management activities. Concentration of Risk, Derivative Instruments, Assets Concentration of Risk, Derivative Instruments, Assets Represents aggregate of individually significant counterparties of total assets arising from derivative instruments from price risk management activities. Counterparty C Counterparty C Individually significant counterparty of total assets arising from derivative instruments from price risk management activities. Counterparty D Counterparty G PRM Liabilities Counterparty G PRM Liabilities Counterparty E Counterparty E Individually significant counterparty of total assets arising from derivative instruments from price risk management activities. Counterparty F Counterparty F Individually significant counterparty of total liabilities arising from derivative instruments from price risk management activities. Concentration of Risk, Derivative Instruments, Liabilities Concentration of Risk, Derivative Instruments, Liabilities Represents aggregate of individually significant counterparties of total liabilities arising from derivative instruments from price risk management activities. Schedule of Regulatory Assets and Liabilities [Text Block] Schedule of Regulatory Assets and Liabilities [Text Block] Commitments and Guarantees [Abstract] Commitments and Guarantees [Abstract] Long-term Contracts for Purchase of Electric Power [Table] Long-term Contracts for Purchase of Electric Power [Table] Long-term Purchase Commitment by Category of Item Purchased [Axis] Category of Item Purchased [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Priest Rapids and Wanapum [Member] Priest Rapids and Wanapum [Member] Priest Rapids and Wanapum [Member] Wells [Member] Wells [Member] Wells [Member] Portland Hydro [Member] Portland Hydro [Member] Portland Hydro [Member] Long-term Contract for Purchase of Electric Power [Line Items] Long-term Contract for Purchase of Electric Power [Line Items] Revenue Bonds issued by the Public Utility Districts Revenue Bonds issued by the Public Utility Districts Revenue Bonds issued by the Public Utility Districts PGE Share of Output PGE Share of Output PGE Share of Output from the individual Public Utility Districts PGE Share of Capacity PGE portion of Capacity PGE portion of Capacity from Public Utility Districts Long-term Contract for Purchase of Electric Power, Date of Contract Expiration Long-term Contract for Purchase of Electric Power, Date of Contract Expiration commitment costs commitment costs commitment costs of contracts with the Public Utility Districts Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value by Asset Class [Axis] Asset Class [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Asset Class [Domain] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Net realized and unrealized losses Realized and Unrealized Gains and Losses, Net, Commodity Contract Realized and Unrealized Gains and Losses, Net, Commodity Contracts Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Net transfers out of Level 3 to Level 2 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Net liabilities from price risk management activities as of end of year Net Liabilities From Price Risk Management Activities Classified As Level 3 Net Liabilities From Price Risk Management Activities Classified as Level 3 Level 3 net unrealized losses that have been fully offset by the effect of regulatory accounting Level 3 realized and unrealized losses offset by the effect of regulatory accounting Level 3 net realized and unrealized losses that have been offset by the effect of regulatory accounting. Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Regulatory Assets Earning a Return, Other Category Regulatory Assets Earning a Return, Other Category Regulatory assets in 'other' category earning a rate of return. Regulatory Assets Earning a Return Regulatory Assets Earning a Return Regulatory assets earning a rate of return. Regulatory Assets Earning a Rate of Return at the Cost of Capital Regulatory Assets Earning a Rate of Return at the Cost of Capital Regulatory assets earning a rate of return at the cost of capital. Authorized Cost of Capital Authorized Cost of Capital Authorized cost of capital rate. Regulatory Assets Earning a Rate of Return by Inclusion in Rate Base Regulatory Assets Earning a Rate of Return by Inclusion in Rate Base Regulatory assets earning a rate of return by inclusion in rate base. Regulatory Assets Earning a Rate of Return at the Approved Rate Regulatory Assets Earning a Rate of Return at the Approved Rate Regulatory assets earning a rate of return at the approved rate. Approved Rate for Deferred Account Under Amortization, Low End of Range Approved Rate for Deferred Account Under Amortization, Low End of Range Low end of the range of approved rates of return for amortizing deferred accounts (regulatory assets). Approved Rate for Deferred Accounts under Amortization, High End of Range Approved Rate for Deferred Accounts under Amortization, High End of Range High end of the range of approved rates of return for amortizing deferred accounts (regulatory assets). Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] investment in Trojan investment in Trojan The portion of the Company's remaining investment in its Trojan plant that the OPUC allowed the Company to recover. Refund to customers for Trojan Investment including interest refund to customers for Trojan Investment including interest refund to customers for Trojan Investment including interest Class action damages sought Class action lawsuit damages sought Class action lawsuit damages sought by plaintiffs against the Company. Site Contingency, Names of Other Potentially Responsible Parties Site Contingency, Names of Other Potentially Responsible Parties Low estimate of range of cost of Portland Harbor cleanup in total Low estimate of range of cost of Portland Harbor cleanup in total Lower end estimate of the range of cost of Portland Harbor cleanup, in total. This represents the cost to all parties, not PGE portion. Upper estimated range of total cost of Portland harbor cleanup Upper estimated range of total cost of Portland harbor cleanup Upper estimated range of total cost of Portland harbor cleanup. This is the estimated cost for all parties, not PGE portion. Loss Contingency, Range of Possible Loss, Maximum Loss Contingency, Range of Possible Loss, Maximum Civil Penalty Claim - Per day per violation through January 12, 2009 Civil Penalty Claim - Per day per violation through January 12, 2009 Civil Penalty Claim - Per Day Per Violation through January 12, 2009 Civil Penalty Claim - Per day per violation after January 12, 2009 Civil Penalty Claim - Per day per violation after January 12, 2009 Civil Penalty Claim - Per day per violation after January 12, 2009 Claims moved to dismiss Claims moved to dismiss Number of claims moved to dismiss in this matter. Loss Contingency, Pending Claims, Number Loss Contingency, Pending Claims, Number projects added to plaintiff's suit projects added to plaintiff's suit projects added to plaintiff's suit projects encompassed by suit projects encompassed by suit projects encompassed by suit DEI [Abstract] DEI [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Trading Symbol Trading Symbol Schedule of Asset Retirement Obligations [Table Text Block] Schedule of Asset Retirement Obligations [Table Text Block] Schedule of Change in Asset Retirement Obligation [Table Text Block] Schedule of Change in Asset Retirement Obligation [Table Text Block] Pension Plans, Defined Benefit [Member] Pension Plan [Member] Defined Benefit Plan, Fair Value of Plan Assets by Measurement [Axis] Defined Benefit Plan, Expected Future Benefit Payments in Year One Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months Defined Benefit Plan, Expected Future Benefit Payments in Year Two Defined Benefit Plan, Expected Future Benefit Payments, Year Two Defined Benefit Plan, Expected Future Benefit Payments in Year Three Defined Benefit Plan, Expected Future Benefit Payments, Year Three Defined Benefit Plan, Expected Future Benefit Payments in Year Four Defined Benefit Plan, Expected Future Benefit Payments, Year Four Defined Benefit Plan, Expected Future Benefit Payments in Year Five Defined Benefit Plan, Expected Future Benefit Payments, Year Five Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Increase (decrease) in net liabilities from price risk management activities Increase (Decrease) in Risk Management Assets and Liabilities Regulatory deferrals—price risk management activities Gain (Loss) from Price Risk Management Activity Deferred income taxes Deferred Income Tax Expense (Benefit) Allowance for equity funds used during construction Pension and other postretirement benefits Pension and Other Postretirement Benefit Expense Regulatory deferral of settled derivative instruments Gain (Loss) on Contract Termination Unrealized losses on non-qualified benefit plan trust assets Unrealized Gain (Loss) on Securities Decoupling mechanism deferrals, net of amortization Decoupling Mechanism Deferrals, Net The deferral, which can be either a positive or negaitive amount depending on whether a collection from or refund to customers results, of the amounts recorded in net income for energy useage by customers on a weather adjusted basis that is different from base rates as determined under the Company's decoupling mechanism, expected to be recovered or refunded in future periods. Power cost deferrals, net of amortization Increase (Decrease) in over (under) Energy Recovery Other non-cash income and expenses, net Other Noncash Income (Expense) Changes in working capital, net of effects from purchase of 10% interest in Boardman in 2014: Increase (Decrease) in Operating Capital [Abstract] (Increase) decrease in receivables and unbilled revenues Increase (Decrease) in Receivables (Increase) decrease in margin deposits Increase (Decrease) in Margin Deposits Outstanding Increase (decrease) in payables and accrued liabilities Increase (Decrease) in Accounts Payable Other working capital items, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Increase (Decrease) in Customer Advances and Deposits Increase (Decrease) in Customer Advances and Deposits Proceeds received from Trojan spent fuel legal settlement Proceeds from Legal Settlements Contribution to non-qualified employee benefit trust Increase (Decrease) in Deferred Compensation Contribution to voluntary employees’ benefit association trust Contribution to the voluntary employees’ beneficiary association trust The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its non-pension postretirement benefit plans. Other, net Increase (Decrease) in Other Operating Assets Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Purchases of nuclear decommissioning trust securities Payments to Acquire Investments to be Held in Decommissioning Trust Fund Sales of nuclear decommissioning trust securities Proceeds from Sale, Maturity and Collection of Investments Distribution from (contribution to) nuclear decommissioning trust Payments for (Proceeds from) Investments Sales tax refund received - Tucannon River Wind Farm Increase (Decrease) in Other Receivables Cash received in connection with purchase of 10% interest in Boardman, net of cash paid Cash Acquired from Acquisition Proceeds received from insurance recoveries Proceeds from Insurance Settlement, Investing Activities Proceeds from sale of properties Proceeds from Sale of Productive Assets Other, net Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt Payments on long-term debt Repayments of Long-term Debt Proceeds from issuance of common stock, net of issuance costs Proceeds from Issuance of Common Stock Borrowings on short-term debt Proceeds from Short-term Debt Payments on short-term debt Repayments of Short-term Debt Maturities of commercial paper, net Repayments of Commercial Paper Issuance (maturities) of commercial paper, net Proceeds from Issuance of Commercial Paper Dividends paid Payments of Dividends Debt issuance costs Payments of Debt Issuance Costs Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities (Decrease) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of year Cash and cash equivalents, end of year Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for interest, net of amounts capitalized Interest Paid, Net Cash paid for income taxes Income Taxes Paid Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Accrued capital additions Capital Expenditures Incurred but Not yet Paid Accrued dividends payable Dividends Payable Accrued sales tax refund related to Tucannon River Wind Farm Preliminary engineering transferred to Construction work in progress from Other noncurrent assets Preliminary engineering transferred to construction work in progress Preliminary engineering costs transferred to construction work in progress during the period Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Other Postretirement Benefit Plans [Member] Amounts included in comprehensive income: Amounts included in comprehensive income: [Abstract] Amounts included in comprehensive income: [Abstract] Benefit obligation: Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] As of January 1 Defined Benefit Plan, Benefit Obligation Fair value of plan assets: Assets, Fair Value Disclosure [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost on benefit obligation Defined Benefit Plan, Interest Cost Participants’ contributions Defined Benefit Plan, Contributions by Plan Participants Actuarial loss (gain) Defined Benefit Plan, Actuarial Gain (Loss) Defined Benefit Plan, Special Termination Benefits Defined Benefit Plan, Special Termination Benefits Benefit payments Defined Benefit Plan, Administration Expenses Defined Benefit Plan, Administration Expenses As of January 1 Unfunded position as of December 31 Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Benefit Obligation Net actuarial loss (gain) included in comprehensive income Net actuarial loss (gain) included in comprehensive income The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.included in comprehensive income Defined Benefit Plan, Amortization of Gains (Losses) Defined Benefit Plan, Amortization of Gains (Losses) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Total Amounts included in comprehensive income Total Amounts included in comprehensive income Total Amounts included in comprehensive income during the period from Defined Benefit Plans. Defined Benefit Plan, Accumulated Benefit Obligation Defined Benefit Plan, Accumulated Benefit Obligation Actual return on plan assets Defined Benefit Plan, Actual Return on Plan Assets Company contributions Defined Benefit Plan, Contributions by Employer Classification in consolidated balance sheet: Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract] Noncurrent asset Current liability Pension and Other Postretirement Defined Benefit Plans, Current Liabilities Noncurrent liability Amounts included in AOCL: Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax [Abstract] Net actuarial loss Net actuarial loss Net actuarial loss from Defined Benefit Plans included in Accumulated Other Comprehensive Income. Prior service cost Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Assumptions used: Defined Benefit Plan, Assumptions Used in Calculations [Abstract] Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate Defined Benefit Plan Discount rate - upper range Defined Benefit Plan Discount rate - upper range The interest rate used to adjust for the time value of money for the Defiend Benefit Plan Discount rate - upper range. Discount rate used to calculate benefit obligation Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan Cost Discount rate - upper range Defined Benefit Plan Cost Discount rate - upper range Defined Benefit Plan Cost Discount rate - upper range Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Long-term rate of return on plan assets Long-term rate of return on plan assets Long-term rate of return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Property, Plant and Equipment [Table] Jointly Owned Utility Plant, Proportionate Ownership Share of Boardman transferred Jointly Owned Utility Plant, Proportionate Ownership Share of Boardman transferred Jointly Owned Utility Plant, Proportionate Ownership Share of Boardman transferred Disposal Group, Including Discontinued Operation, Consideration Disposal Group, Including Discontinued Operation, Consideration Property, Plant and Equipment, Additions Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Asset Retirement Obligation Increase related to Boardman plant Asset Retirement Obligation Increase related to Boardman plant Asset Retirement Obligation Increase related to Boardman plant due to updated decommissioning study. Interest in Pacific Northwest Intertie Interest in Pacific Northwest Intertie Interest in Pacific Northwest Intertie 2015 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2016 Long-term Debt, Maturities, Repayments of Principal in Year Two 2017 Long-term Debt, Maturities, Repayments of Principal in Year Three 2018 Long-term Debt, Maturities, Repayments of Principal in Year Four 2019 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total long-term debt Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] First Mortgage Bonds, rates range from 3.46% to 9.31%, with a weighted average rate of 5.42% in 2014 and 5.62% in 2013, due at various dates through 2048 Long-term Debt - First Mortgage Bonds Long-term Debt - First Mortgage Bonds Unsecured Debt, Current Unsecured Debt, Current Pollution Control Revenue Bonds, 5% rate, due 2033 Long-term Pollution Control Bond Pollution Control Revenue Bonds owned by PGE Pollution Control Revenue Bonds owned by PGE Pollution Control Revenue Bonds owned by PGE Less: current portion of long-term debt Outstanding, Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Outstanding, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Granted, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Forfeited, Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Vested, Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Vested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Outstanding, Units Outstanding, Weighted Average Grant Date Fair Value Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of prior service cost Amortization of net actuarial loss Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost Long-term Purchase Commitment [Table] Long-term Purchase Commitment [Table] Long-term Purchase Commitment [Line Items] Long-term Purchase Commitment [Line Items] Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] Schedule of Long-term Contracts for Purchase of Electric Power [Table Text Block] Schedule of Long-term Contracts for Purchase of Electric Power [Table Text Block] Minimum Guarantees, Policy [Policy Text Block] Minimum Guarantees, Policy [Policy Text Block] Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Investments held in trust [Table Text Block] investments held in trust [Table Text Block] investments held in trust [Table Text Block] Schedule of Other Assets and Other Liabilities [Table Text Block] Schedule of Other Assets and Other Liabilities [Table Text Block] Incorporated Cities Incorporated Cities Number of incorporated cities in service area. Service Area Sq Miles Service Area Sq Miles Approximate square miles of service area. Number of Retail Customers Number of Retail Customers Includes residential, commercial and industrial. Service area population Service Area Population Service Area Population Percent of State's Population Percent of State's Population Service area population as a percent of the state's population. Entity Number of Employees Entity Number of Employees Number of Union Employees Number of Union Employees Number of employees subject to collective bargaining agreements. Number of Union Employees Subject to Agreement A Number of Union Employees Subject to Agreement-A Number of employees subject to collective bargaining agreement A. Number of Union Employees Subject to Agreement B Number of Union Employees Subject to Agreement B Number of employees subject to collective bargaining agreement B. revenue overstatment revenue overstatment Adjustment to revenue to reduce total for the overstatment of a prior customer billing. Income Taxes Note [Abstract] Income Taxes Note [Abstract] Income Taxes Income Tax Disclosure [Text Block] Price risk management assets and liabilities subject to master netting agreements [Table] Electricity Volume Related to Derivative Instruments Held at Balance Sheet Date, Commodity Contracts, Electricity Net volume related to the reporting entity's derivative instruments as of the balance sheet date having arisen from price risk management activities. Natural gas Volume Related to Derivative Instruments at Balance Sheet Date, Commodity Contracts, Natural Gas Net volume associated with the reporting entity's derivative instruments recorded as of the balance sheet date having arisen from price risk management activities related to natural gas. Foreign currency exchange Volume Related to Derivative Instruments Held at Balance Sheet Date, Foreign Currency Net amount associated with the reporting entity's derivative instruments recorded as of the balance sheet date having arisen from price risk management activities related to foreign currency. Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Proceeds from Issuance of First Mortgage Bond Proceeds from Issuance of First Mortgage Bond Repayments of Debt Repayments of Debt Long-term Pollution Control Bond Remarketable Pollution Control Bonds Remarketable Pollution Control Bonds held by the Company. Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Proceeds from Issuance of Long-term Debt First mortgage Bonds - minimum rate First mortgage Bonds - minimum rate First mortgage Bonds - minimum rate First Mortgage Bonds - maximum rate First Mortgage Bonds - maximum rate First Mortgage Bonds - maximum rate Debt, Weighted Average Interest Rate Debt, Weighted Average Interest Rate Unsecured term bank loan rate - minimum Unsecured term bank loan rate - minimum Unsecured term bank loan rate - minimum Unsecured term bank loan rate - maximum Unsecured term bank loan rate - maximum Unsecured term bank loan rate - maximum Pollution Control Revenue Bonds owned by PGE Long-term Pollution Control Bond, Rate Long-term Pollution Control Bond, Rate Long-term Pollution Control Bond, Rate Common Stock [Member] Stock Issued During Period, Shares, New Issues Proceeds from Issuance of Common Stock employee stock purchase plan shares authorized employee stock purchase plan shares authorized employee stock purchase plan shares authorized Employee Stock Purchase Plan, Base Pay Threshold Employee Stock Purchase Plan, Base Pay Threshold Employee Stock Purchase Plan, Base Pay Threshold Employee Stock Purchase Plan, Purchased Stock Value Limitation Employee Stock Purchase Plan, Purchased Stock Value Limitation Employee Stock Purchase Plan, Purchased Stock Value Limitation Employee Stock Purchase Plan, Share Purchase Limitation Employee Stock Purchase Plan, Share Purchase Limitation Employee Stock Purchase Plan, Share Purchase Limitation Employee Stock Purchase Plan, Purchase Price Employee Stock Purchase Plan Purchase Price Employee Stock Purchase Plan, Purchase Price reflected in percentage of FMV at Purchase date. Employee Stock Purchase Plan, Number of Available Shares Employee Stock Purchase Plan, Number of Available Shares Employee Stock Purchase Plan, Number of Available Shares Dividend Reinvestment and Direct Stock Purchase Plan Shares Dividend Reinvestment and Direct Stock Purchase Plan Shares Represents common shares set aside, issued and available for issue related to the Dividend Reinvestment and Direct Stock Purchase Plan Dividend Reinvestment and Direct Stock Purchase Plan, Number of Available Shares Dividend Reinvestment and Direct Stock Purchase Plan, Number of Available Shares Dividend Reinvestment and Direct Stock Purchase Plan, Number of Available Shares Assets and Liabilities associated with Non Qualified Benefit Plans [Table Text Block] Assets and Liabilities associated with Non Qualified Benefit Plans [Table Text Block] Assets and Liabilities associated with Non Qualified Benefit Plans [Table Text Block] Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Net Benefit Costs [Table Text Block] Schedule of Net Benefit Costs [Table Text Block] Schedule of Expected Benefit Payments [Table Text Block] Schedule of Expected Benefit Payments [Table Text Block] Other comprehensive income (loss) - Change in compensation retirement benefits liability and amortization, net of taxes of an immaterial amount in 2015, $2 in 2014, and $(1) in 2013 Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: comprehensive loss attributable to the noncontrolling interests Comprehensive income attributable to Portland General Electric Company Comprehensive Income (Loss), Net of Tax, Attributable to Parent Balance Sheet Compnents [Abstract] Balance Sheet Compnents [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Balance as of beginning of year Increase in provision Provision for Doubtful Accounts Amounts written off, less recoveries Allowance for Doubtful Accounts Receivable, Write-offs Balance as of end of year Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Weighted Average Number of Shares Outstanding, Basic Weighted Average Number Diluted Shares Outstanding Adjustment Weighted Average Number Diluted Shares Outstanding Adjustment Weighted Average Number of Shares Outstanding, Diluted Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Share-based Compensation Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Adjustments Related to Tax Withholding for Share-based Compensation Adjustments Related to Tax Withholding for Share-based Compensation Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Stock-based Compensation, Attainment of Performance Goals That Allows Vesting Stock-based Compensation, Attainment of Performance Goals That Allows Vesting Rate used in the determination of stock-based compensation expense for performance stock units. Assumed level of attainment of performance goals that allows the vesting of this percent. Stock-based Compensation, Forfeiture Rate Stock-based Compensation, Forfeiture Rate Forfeiture rate used in determining the period stock-based compensation expense. Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount stock based compensation impact on cash flows stock based compensation impact on cash flows stock based compensation impact on cash flows Performance based stock award percentage - minimum Performance based stock award percentage - minimum Performance based stock award percentage - minimum Performance based stock award percentage - maximum Performance based stock award percentage - maximum Performance based stock award percentage - maximum Estimated average service lives [Table Text Block] Estimated average service lives [Table Text Block] Estimated average service lives [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Number of Years Number of Years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Capital Additions [Member] Capital Addition Purchase Commitments [Member] Long-term Contract for Purchase of Electric Power [Domain] Long-term Contract for Purchase of Electric Power [Domain] Electric Transmission [Member] Electric Transmission [Member] Public Utility Districts [Member] Public Utility Districts [Member] Future Minimum payments to Public Utility Districts for purchase obligations [Member] Natural gas [Member] Public Utilities, Inventory, Fuel [Member] Coal and transportationSupply Agreements [Member] Coal Supply Agreements [Member] Operatomg leases [Member] Lease Agreements [Member] Commitments [Member] Commitments [Member] Unrecorded Unconditional Purchase Obligation Unrecorded Unconditional Purchase Obligation Unrecorded Unconditional Purchase Obligation, Due within One Year Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months Unrecorded Unconditional Purchase Obligation, Due within Two Years Unrecorded Unconditional Purchase Obligation, Due within Two Years Unrecorded Unconditional Purchase Obligation, Due within Three Years Unrecorded Unconditional Purchase Obligation, Due within Three Years Unrecorded Unconditional Purchase Obligation, Due within Four Years Unrecorded Unconditional Purchase Obligation, Due within Four Years Unrecorded Unconditional Purchase Obligation, Due within Five Years Unrecorded Unconditional Purchase Obligation, Due within Five Years Unrecorded Unconditional Purchase Obligation, Due after Five Years Unrecorded Unconditional Purchase Obligation, Due after Five Years