Regulatory Assets and Liabilities Disclosure [Abstract] Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Southern California Edison Southern California Edison Company [Member] Represents Southern California Edison, a public utility that is a subsidiary of Edison International. Regulatory Assets [Line Items] Regulatory Assets [Line Items] Regulatory Assets Included on the Consolidated Balance Sheets Schedule of Regulatory Assets [Table Text Block] Regulatory Liabilities Included on the Consolidated Balance Sheets Schedule of Regulatory Liabilities [Table Text Block] Schedule of Regulatory Balancing Accounts Schedule of Regulatory Balancing Accounts [Table Text Block] Schedule of Regulatory Balancing Accounts [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Fair Value of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Summarization of Economic Hedging Activities Derivative Instruments, Gain (Loss) [Table Text Block] Notional Volumes of Derivative Instruments Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flows Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 3 Fair Value, Inputs, Level 3 [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] Fair Value Disclosures Level 3 [Roll Forward] Fair Value Disclosures Level 3 [Roll Forward] -- None. No documentation exists for this element. -- Fair value of net liabilities at beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total realized/unrealized gains (losses): Net Realized or Unrealized Gain (Loss) [Abstract] -- None. No documentation exists for this element. -- Included in regulatory assets and liabilities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Regulatory Assets and Liabilities This element represents total gains or losses for the period (realized and unrealized), included in regulatory assets and liabilities measured at fair value on a recurring basis using unobservable inputs (level 3). Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fair value of net liabilities at end of period Change during the period in unrealized losses related to assets and liabilities held at the end of the period Increase (Decrease) During Period in Unrealized Gains (Losses) Related to Level 3 Financial Instruments Held at Period End This element represents the change during the period in unrealized gains (losses) for financial instruments, held at the end of the period, with unobservable inputs (level 3). Commitments and Contingencies Disclosure [Abstract] Schedule of Commitments and Contingencies [Table] Schedule of Commitments and Contingencies [Table] Represents the information pertaining to Commitments and Contingencies. Settlement Components [Axis] Settlement Components [Axis] Settlement Components [Axis] Settlement Components [Domain] Settlement Components [Domain] [Domain] for Settlement Components [Axis] Amount Returned To Customers [Member] Amount Returned To Customers [Member] Amount Returned To Customers [Member] Amount Returned To Shareholders [Member] Amount Returned To Shareholders [Member] Amount Returned To Shareholders [Member] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] San Onofre (nuclear) San Onofre [Member] Jointly owned plant in connection with the generation of electricity including nuclear projects pertaining to San Onofre (nuclear). San Onofre and Palo Verde San Onofre and Palo Verde [Member] San Onofre and Palo Verde [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] San Gabriel Windstorm Investigation San Gabriel Windstorm Investigation [Member] San Gabriel Windstorm Investigation [Member] Alleged violations of PSD requirements and New Source Performance Standards of the CAA Alleged violations of PSD requirements and New Source Performance Standards of the CAA [Member] Alleged violations of PSD requirements and New Source Performance Standards of the CAA [Member] Nuclear Insurance Insurance Claims [Member] Tort claims for onsite workers Tort Claims For Onsite Workers [Member] Tort Claims For Onsite Workers [Member] SCE and other owners of San Onofre and Palo Verde SCE And Other Owners Of San Onofre And Palo Verde [Member] Southern California Edison and other owners of San Onofre and Palo Verde. Schedule Of Commitments And Contingencies [Line Items] Schedule Of Commitments And Contingencies [Line Items] Schedule Of Commitments And Contingencies [Line Items] San Bernardino settlement amount Loss Contingency, Estimate of Possible Loss Number of plaintiffs in Four Corners environmental matters Loss Contingency, Number of Plaintiffs Identified material sites for environmental remediation (in number of sites) Number of Sites Identified for Environmental Remediation The number of material identified sites which have a recorded environmental remediation liability as the costs can be estimated and are probable. Minimum costs to be Identified Site Minimum costs to be Identified Site The upper end of the range of a site's cost estimate must be at least this amount to be classified as a material identified site. Below this amount an identified site will be an immaterial site. Minimum liability for environmental remediation for material sites Accrual for Environmental Loss Contingencies Immaterial sites for environmental remediation (in number of sites) Number of Immaterial Sites for Environmental Remediation The number of immaterial identified sites which have a recorded environmental remediation liability as the costs can be estimated and are probable. Total minimum recorded liability for immaterial sites Loss Contingency, Range of Possible Loss, Minimum Environmental remediation liability Accrued Environmental Loss Contingencies, Noncurrent Regulatory assets related to environmental remediation Regulatory Assets, Noncurrent, Environmental Remediation Regulatory Assets, Noncurrent, Environmental Remediation Portion of recorded liability recoverable from incentive mechanism Portion of Recorded Liability Recoverable From Incentive Mechanism The portion of the recorded liability for environmental remediation costs recoverable through incentive mechanism. Percentage of environmental remediation costs recoverable through an incentive mechanism (as a percent) Percentage of Environmental Remediation Costs Recoverable From Incentive Mechanism The percentage of environmental remediation costs entity will recover through incentive mechanism. Liability incurred at majority of the remaining sites through customer rates Recorded Liability Incurred at Majority of Remaining Sites Through Customer Rates Represents the recorded liability incurred at majority of the remaining sites through customer rates. Environmental remediation costs to be recovered (as a percent) Percentage of Environmental Remediation Costs to be Recovered Represents the percentage of environmental remediation costs to be recovered. Amount that cleanup costs could exceed recorded liability for identified material sites Amount that Cleanup Costs for Identified Material Sites Could Exceed Recorded Liability The potential estimated cleanup costs for identified material sites in excess of the minimum liability that is accrued as of the balance sheet date for environmental loss contingencies. Amount that cleanup costs could exceed recorded liability for immaterial sites Amount that Cleanup Costs for Immaterial Sites Could Exceed Recorded Liability The potential estimated cleanup costs for immaterial sites in excess of the minimum liability that is accrued as of the balance sheet date for environmental loss contingencies. Maximum expected period for cleanup of identified sites (in years) Maximum Expected Period for Clean Up of Identified Sites Maximum Expected Period for Clean Up of Identified Sites Expected annual environmental remediation costs, low end of range Expected Annual Environmental Remediation Costs, Low End of Range The low end of the range of expected remediation costs in each of the next several years. Expected annual environmental remediation costs, high end of range Expected Annual Environmental Remediation Costs, High End of Range The high end of the range of expected remediation costs in each of the next several years. Environmental remediation costs Environmental Remediation Expense Federal limit on public liability claims from nuclear incident, approximate Federal Limit on Public Liability Claims from Nuclear Incident, Approximate The approximate maximum amount of public liability, as limited by federal law, resulting from a nuclear incident. Private primary insurance purchased Private Primary Insurance Purchased The maximum amount of private primary insurance available, which was purchased. Maximum assessment per each nuclear incident Maximum Deferred Insurance Premium Per Nuclear Incident The maximum amount of deferred insurance premium based on each nuclear incident occurring. Maximum yearly assessment per nuclear incident Maximum Yearly Assessment Per Nuclear Incident The maximum amount of additional insurance premium per yearly assessment charged for each nuclear incident. Loss limit, property damage insurance, federal minimum requirement Loss Limit, Property Damage Insurance, Federal Minimum Requirement Loss Limit, Property Damage Insurance, Federal Minimum Requirement Limit on assessment of retrospective premium adjustments, per year, approximate Limit on Assessment of Retrospective Premium Adjustments, Per Year, Approximate The approximate maximum yearly retrospective premium adjustments that could be assessed against the entity. Insurance coverage for wildfire liabilities Limit Insurance Coverage for Wildfire Liabilities Limit This element represents the insurance coverage limit for wildfire liabilities. Self insurance retention per wildfire occurrence Increase In Self Insurance Retention Per Wildfire Occurrence This element represents the increase in self insurance retention per wildfire occurrence. Wildfire Threshold For Additional Coverage Wildfire Threshold For Additional Coverage Wildfire Threshold For Additional Coverage Amount of damages, decision by US Court of Federal Claims, spent nuclear fuel litigation Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation The amount of damages in decision by United States Court of Federal Claims, subject to appeal, regarding spent nuclear fuel. Damages sought Loss Contingency, Damages Sought, Value Income Tax Disclosure [Abstract] Income Tax Disclosures [Table] Income Tax Disclosures [Table] Disclosures pertaining to components of income tax expense, deferred income tax assets and liabilities, reconciliation of the reported amount of income tax expense to the amount of income tax expense that would result from applying domestic federal stautory rates to pretax income and tax uncertainities. Tax Period [Axis] Tax Period [Axis] Information about the period subject to enacted tax laws. Tax Period [Domain] Tax Period [Domain] [Domain] for Information about the period subject to enacted tax laws. Tax Years 2003 to 2006 Tax Years 2003 to 2006 [Member] Tax Years 2003 to 2006 [Member] Tax Years 2007 to 2009 Tax Years 2007 to 2009 [Member] Tax Years 2007 to 2009 [Member] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] IRS Examination Internal Revenue Service (IRS) [Member] Tax Adjustment [Axis] Tax Adjustment [Axis] Tax Adjustment [Axis] Tax Adjustment [Domain] Tax Adjustment [Domain] [Domain] for Tax Adjustment [Axis] Proposed Adjustment to Taxable Gain Proposed Adjustment to Taxable Gain [Member] Proposed Adjustment to Taxable Gain [Member] Disallowance of Repair Allowance Deduction Disallowance of Repair Allowance Deduction [Member] Disallowance of Repair Allowance Deduction [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Income Tax Disclosure [Line Items] Income Tax Disclosures [Line Items] Income Tax Disclosures [Line Items] Reduction to revenue from repair deductions, before tax Flow Through Tax Benefits For Repair Deductions Income Statement Effect Before Tax Flow Through Tax Benefits For Repair Deductions Income Statement Effect Before Tax Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment Income Tax Examination, Estimate of Possible Loss Deposit against IRS tax dispute adjustment Income Tax Examination, Estimate of Possible Loss, Deposit Income Tax Examination, Estimate of Possible Loss, Deposit Estimated tax benefits Tax Adjustments, Settlements, and Unusual Provisions Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Effective Tax Rate Effective Income Tax Rate Reconciliation, Amount [Abstract] Income (loss) from continuing operations before income taxes Income from Continuing Operations before Income Taxes and Noncontrolling Interest Sum of operating profit and nonoperating income or expense before income taxes and noncontrolling interest. Provision for income tax at federal statutory rate of 35% Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State tax, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Property-related Income Tax Reconciliation Property Related The portion of the difference between the total income tax expense (benefit) as reported in the Income Statement for the year/accounting period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates. Change related to uncertain tax positions Income Tax Reconciliation Adjustment Tax Reserve Adjustment Income Tax Reconciliation Adjustment Tax Reserve Adjustment San Onofre OII settlement Income Tax Reconciliation Settlement Amount Income Tax Reconciliation Settlement Amount Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total income tax expense (benefit) from continuing operations Income Tax Expense (Benefit) Effective Tax Rate Excluding Income Attributable to Noncontrolling Interests Effective Tax Rate Excluding Income Attributable to Noncontrolling Interests Effective Tax Rate Excluding Income Attributable to Noncontrolling Interests Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Regulated Entity, Other Assets, Noncurrent [Abstract] Fair Value Disclosures Measured on Recurring Basis [Table] Fair Value Disclosures Measured on Recurring Basis [Table] Disclosures pertaining to fair value of assets and liabilities measured on recurring basis including unobservable inputs and other relevant disclosures. Fair Value, Assets and Liabilities Measured on Recurring Basis, Asset Type [Axis] Fair Value, Assets and Liabilities Measured on Recurring Basis, Asset Type [Axis] Disclosures of type of financial assets and liabilities valued on recurring basis. Fair Value Assets and Liabilities Measured on Recurring Basis Asset Type [Domain] Fair Value Assets and Liabilities Measured on Recurring Basis Asset Type [Domain] Disclosures of type of financial assets and liabilities valued on recurring basis. Stocks Equity Securities [Member] Municipal bonds Municipal Bonds [Member] U.S. government and agency securities US Government Debt Securities [Member] Corporate bonds Corporate Bond Securities [Member] Short-term investments and receivables/payables Short-term Investments [Member] Fair Value Disclosures: Fair Value Disclosures [Line Items] -- None. No documentation exists for this element. -- Nuclear Decommissioning Trusts Disclosures Assets Held-in-trust [Abstract] Longest Maturity Dates (in years) Maturity Dates Decommissioning Trust Investments The maturity dates for decommissioning trust investments. Total Investments, Amortized Cost Decommissioning Trust Investments Amortized Cost Decommissioning Trust Investments Amortized Cost Total Investments, Fair Value Decommissioning Trust Investments Decommissioning Trust Investments Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Commercial paper Commercial Paper [Member] Letters of credit Letter of Credit [Member] Edison International Parent and Other Parent Company [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] First and refunding mortgage bonds First And Refunding Mortgage Bonds [Member] Represents debt in the form of bonds secured by first and refunding mortgages, due 2014-2043, with interest ranging from 3.5% to 6.05% and floating. Revolving credit facility Credit Facility May 2017 [Member] Credit Facility May 2017 [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Issuance of debt Debt Instrument, Face Amount Outstanding borrowings Line of Credit Facility, Amount Outstanding Weighted average interest rate (as a percent) Short-term Debt, Weighted Average Interest Rate Commitment Line of Credit Facility, Maximum Borrowing Capacity Outstanding letters of credit Letters of Credit Outstanding, Amount Letters of credit expiration period Short-term Debt, Expiration Period Short-term Debt, Expiration Period Short-term debt Short-term Debt Stated interest rate on May 2014 mortgage bonds due in May 2017 Debt Instrument, Interest Rate, Stated Percentage Variable Interest Entities Disclosure [Abstract] -- None. No documentation exists for this element. -- Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Variable Interest Entities by Name of Entity [Axis] Variable Interest Entities by Name of Entity [Axis] This element represents variable interest entities classified by name. Name of Variable Interest Entity [Domain] Name of Variable Interest Entity [Domain] This element represents variable interest entities classified by name. SCE Power Purchase Contracts SCE Power Purchase Contracts [Member] This element represents the power purchase agreements, in which SCE holds variable interests. SCE Trust I Southern California Edison Trust I [Member] Southern California Edison Trust I [Member] SCE Trust II Southern California Edison Trust II [Member] Southern California Edison Trust II [Member] SCE Trust III Southern California Edison Trust III [Member] Southern California Edison Trust III [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Trust Securities Trust Securities [Member] Trust Securities [Member] Series F Preferred Stock Series F Preferred Stock [Member] Series G Preferred Stock Series G Preferred Stock [Member] Series H Preferred Stock Series H Preferred Stock [Member] Variable Interest Entity Variable Interest Entity [Line Items] Variable Interest Entities, Dividend Income Variable Interest Entities, Dividend Income Variable Interest Entities, Dividend Income Variable Interest Entities, Dividend Distributions Variable Interest Entities, Dividend Distributions Variable Interest Entities, Dividend Distributions Details of projects or entities Disclosure Variable Interest Entity [Abstract] -- None. No documentation exists for this element. -- Power generating capacity (in megawatts) Power Generating Capacity of Projects Owned Controlled Power generating capacity of the project owned and/or controlled by the entity. Payments to unconsolidated VIEs for power purchase contracts Payments To Unconsolidated VIEs Power Purchase Contracts Payments for electricity purchased during the reporting period under power purchase contracts with unconsolidated VIEs. Future Power Generating Capacity of Projects Owned Controlled Future Power Generating Capacity of Projects Owned Controlled Future Power Generating Capacity of Projects Owned Controlled Unconsolidated Trust Trusts [Abstract] Security dividend rate, (as a percent) Preferred Stock, Dividend Rate, Percentage Liquidation preference Preferred Stock, Liquidation Preference, Value Liquidation value (in dollars per share) Preferred Stock, Liquidation Preference Per Share Common stock Common Stock, Value, Issued Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Netting and Collateral Netting [Member] Total Estimate of Fair Value Measurement [Member] Fixed income Fixed Income Securities [Member] Short-term investments, primarily cash equivalents Short Term Investments Primarily Cash Equivalents [Member] This element represents the fair value of short-term investments and cash equivalents as of the statement of financial position. Assets and Liabilities at Fair Values Assets and Liabilities at Fair Values [Abstract] -- None. No documentation exists for this element. -- Assets at Fair Value Assets, Fair Value Disclosure [Abstract] Derivative contracts Derivative Asset Other Other Assets, Fair Value Disclosure Nuclear decommissioning trusts Decommissioning Fund Investments, Fair Value Total assets Assets, Fair Value Disclosure Liabilities at Fair Value Liabilities, Fair Value Disclosure [Abstract] Derivative contracts Derivative Liability Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Net assets (liabilities) Fair Value, Net Financial Assets and Liabilities Measured on Recurring Basis This element represents the fair value, Net, financial assets and liabilities as of the statement of financial position. Percentage of equity investments located in the United States (as a percent) Equity Investments, Percentage This element represents the percentage of equity investments located in United States. Collateralized mortgage obligations and other asset backed securities Collateralized Mortgage Obligations and Other Asset Backed Securities (1) Collateralized Mortgage Obligations and Other Asset Backed Securities (1) Receivables (payables) net related to investments Receivables Payables Net Related to Investments Interest and dividends receivables and receivables related to pending securities sales and payables related to pending securities purchases as of the balance sheet date. Money market funds Money Market Funds, at Carrying Value Schedule of Regulatory Assets and Liabilities [Table] Schedule of Regulatory Assets and Liabilities [Table] A table of regulatory assets and liabilities included in the balance sheet. Regulatory Assets and Liabilities [Axis] Regulatory Assets and Liabilities [Axis] The list of the regulatory assets and liabilities itemized in a table of regulatory balance sheet. Regulatory Assets and Liabilities [Domain] Regulatory Assets and Liabilities [Domain] The name of the regulatory assets and liabilities itemized in a table of regulatory balance sheet. Regulatory balancing accounts Regulatory Clause Revenues, under-recovered [Member] Refunds of excess revenue Revenue Subject to Refund [Member] Component of Balancing Account [Axis] Component of Balancing Account [Axis] Component of Balancing Account [Axis] Component of Balancing Account [Domain] Component of Balancing Account [Domain] [Domain] for Component of Balancing Account [Axis] Significant Components Significant Components [Member] Significant Components [Member] Energy resource recovery account Energy Resource Recovery Account [Member] SCE balancing account for fuel and power procurement-related costs. Four Corners memorandum account Four Corners Balancing Account [Member] SCE balancing account associated with costs to maintain Four Corners. New system generation balancing account New System Generation Balancing Account [Member] SCE balancing account to record the benefits and costs of Power Purchase Agreements (PPAs) and SCE owned peaker generation unit associated with new generation resources. Public purpose programs and energy efficiency programs Public Purpose Programs and Energy Efficiency Programs [Member] SCE balancing account related to specific project or programs costs that includes energy efficiency and demand-side management programs that are allowed for recovery. Base rate recovery balancing account Base Rate Recovery Balancing Account [Member] SCE balancing account for differences between amounts collected and authorized levels. Greenhouse gas auction revenue Greenhouse Gas Auction Revenue [Member] SCE balancing account that are sold in quarterly auctions with proceeds are refunded to customers. FERC formula rates and FERC balancing accounts FERC Balancing Account [Member] SCE balancing account to recover its' transmission costs including return on its net investment in transmission assets. FERC energy settlements FERC Energy Settlements [Member] FERC energy settlements [Member] Other Other Balancing Account [Member] SCE Other balancing account that are immaterial to report individually. Regulatory Assets and Liabilities Regulatory Assets and Liabilities [Line Items] -- None. No documentation exists for this element. -- Net liability Net Regulatory Assets Asset Retirement Obligation Disclosure [Abstract] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant Accounting Policies [Table] San Onofre Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Decommissioning Costs, Future Value Decommissioning Liability, Cost Estimate, Undiscounted Decommissioning Liability, Cost Estimate, Undiscounted Asset Retirement Obligation, Discount Rate Asset Retirement Obligation, Discount Rate Asset Retirement Obligation, Discount Rate Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Beginning balance Asset Retirement Obligation Accretion1 Asset Retirement Obligation, Accretion Expense Revisions Asset Retirement Obligation, Revision of Estimate Liabilities settled Asset Retirement Obligation, Liabilities Settled Ending balance Derivative [Table] Derivative [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Current Assets Other Current Assets [Member] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Commodity Contracts Commodity Contract [Member] Segments [Axis] Segments [Axis] Segments [Domain] Electric Utility Electric Utility [Member] Includes information about Electric Utility segment operated by Southern California Edison, a wholly owned subsidiary of Edison International. Derivative Instruments by Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Economic hedges Economic Hedges [Member] Economic hedges are energy contracts that do not qualify for hedge accounting under SFAS No. 133. Cash Collateral Posted Cash Collateral Received (Posted) [Member] Cash Collateral Received (Posted) [Member] Derivatives Derivative [Line Items] Collateral Already Posted, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Fair Value of Derivative Instruments Derivative, Fair Value, Net [Abstract] Short-Term, Derivative Assets Derivative Asset, Current Long-Term, Derivative Assets Derivative Asset, Noncurrent Derivative Assets, Total Short-Term, Derivative Liabilities Derivative Liability, Current Long-Term, Derivative Liabilities Derivative Liability, Noncurrent Derivative Liabilities, Total Net Liability Derivative Assets (Liabilities), at Fair Value, Net Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Fair Value by Level Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Summary of Changes in Fair Value of Level 3 Net Derivative Assets and Liabilities Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table Text Block] Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets and liabilities) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets and liabilities) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liabilities. Valuation Techniques and Significant Unobservable Inputs Used to Determine Fair Value for Level 3 Assets and Liabilities Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] Carrying Amounts and Fair Values of Long-term Debt, Including Current Portion Fair Value, by Balance Sheet Grouping [Table Text Block] Variable Interest Entities Variable Interest Entities Disclosure [Text Block] Entire disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide. Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Retirement Of Plant [Abstract] Retirement Of Plant [Abstract] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Mitsubishi Heavy Industries Ltd [Member] Mitsubishi Heavy Industries Ltd [Member] Mitsubishi Heavy Industries Ltd [Member] Disallowance Of SGRP Investment [Member] Disallowance Of SGRP Investment [Member] Disallowance Of SGRP Investment [Member] Refund of SGRP Revenue Previously Recognized [Member] Refund of SGRP Revenue Previously Recognized [Member] Refund of SGRP Revenue Previously Recognized [Member] Refund Of Flow Through Tax Benefits [Member] Refund Of Flow Through Tax Benefits [Member] Refund Of Flow Through Tax Benefits [Member] Insurance Claims [Member] Rate Period [Axis] Rate Period [Axis] Rate Period [Axis] Rate Period [Domain] Rate Period [Domain] [Domain] for Rate Period [Axis] 2012 Period Rate Period One [Member] Rate Period One [Member] 2013-2014 Periods Rate Period Two [Member] Rate Period Two [Member] Regulatory Liability [Axis] Regulatory Liability [Axis] Regulatory Liability [Domain] Regulatory Liability [Domain] Regulatory Asset [Axis] Regulatory Asset [Axis] Regulatory Asset [Domain] Regulatory Asset [Domain] Property, plant and equipment Building, plant and equipment [Member] Long-lived, depreciable structure held for productive use, which includes building, plant and equipment. Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Replacement Steam Generators Replacement Steam Generators [Member] Replacement Steam Generators [Member] Settlement Agreement Subject Termination Period Settlement Agreement Subject Termination Period Settlement Agreement Subject Termination Period Decommissioning Nuclear Facilities Net Investment Decommissioning Nuclear Facilities Net Investment Decommissioning Nuclear Facilities Net Investment Incremental Inspection and Repair Costs Incremental Inspection and Repair Costs Incremental Inspection and Repair Costs Period For Rate Recovery Period For Rate Recovery Period For Rate Recovery Authorized expenditures by authoritative body, market costs incurred Authorized expenditures by authoritative body, market costs incurred Authorized expenditures by authoritative body, market costs incurred Authorized Return on Preferred Equity Percentage Authorized Return on Preferred Equity Percentage Authorized Return on Preferred Equity Percentage Public Utilities, Approved Return on Equity, Percentage Public Utilities, Approved Return on Equity, Percentage Public Utilities, Approved Incentive, Rate Public Utilities, Approved Incentive, Percentage Incentive that allows to retain 5% of sales proceeds and recover 5% of excess of cancelled contract obligations over cancellation costs. Amount of assets reclassified to a regulatory asset Reclassification To Regulatory Assets Amount Reclassification To Regulatory Assets Amount Impairment and other charges Asset impairment and other charges Asset impairment and other charges Impairment and other charges net of tax Asset impairment net of tax Asset impairment net of tax Cumulative Impact of Settlement Cumulative Impact of Settlement Cumulative Impact of Settlement Cumulative Impact of Settlement, Net of Tax Cumulative Impact of Settlement, Net of Tax Cumulative Impact of Settlement, Net of Tax Net regulatory asset Regulatory assets Decrease in Regulatory Capital Requirements, Common Equity Requirement Decrease in Regulatory Capital Requirements, Common Equity Requirement Insurance Claims, Estimated Amount Reduction in Policy Benefits Following Retirement of Assets Reduction in Policy Benefits Following Retirement of Assets Reduction in Policy Benefits Following Retirement of Assets Warranty Period Warranty Period Warranty Period Maximum Liability Per Purchase Agreement for Damages Maximum Liability Per Purchase Agreement for Damages The maximum aggregate potential liability under the purchase agreement for damages and other amounts in connection with environmental liabilities. Notice of intent to sue, notice time period Notice of intent to sue, notice time period Notice of intent to sue, notice time period Loss Contingency, Damages Sought, Value Loss Contingency Counter Claim Amount Loss Contingency Counter Claim Amount Loss Contingency Counter Claim Amount Reconciliation of income tax expense Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Cash and Cash Equivalents [Abstract] Schedule of Restricted Cash and Cash Equivalents [Table] Schedule of Restricted Cash and Cash Equivalents [Table] Cash and Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] Maximum maturity period of cash equivalent investments (in months) Maximum Maturity of Cash Equivalent Investments Period This element represents the maximum maturity period of the investments considered as cash equivalents. Cash reclassified to accounts payable Cash Reclassified to Accounts Payable This element represents the amount of cash which is reclassified as accounts payable under the cash management program. Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] Compensation and Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Organization and Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Cash Equivalents Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block] Inventory Inventory, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] New Accounting Guidance New Accounting Pronouncements, Policy [Policy Text Block] Compensation and Retirement Disclosure [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Maximum Maximum [Member] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Postretirement Benefits Other Than Pensions Other Postretirement Benefit Plan, Defined Benefit [Member] Pension Plans Pension Plan, Defined Benefit [Member] Pension and Other Postretirement Benefits Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Special Termination Benefits Defined Benefit Plan, Special Termination Benefits Settlement costs Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of net loss Defined Benefit Plan, Amortization of Gains (Losses) Expense under accounting standards Defined Benefit Plan, Net Periodic Benefit Cost Regulatory adjustment Defined Benefit Plan Regulatory Adjustment Deferred The difference between the period's pension costs calculated for GAAP and ratemaking purposes, which is deferred as a regulatory adjustment. Total expense recognized Defined Benefit Plan Net Period Expense The period expense recognized in the consolidated statements of income. Net loss reclassified Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities [Text Block] Expense Components for Plans Schedule of Net Benefit Costs [Table Text Block] Workforce Reductions [Abstract] Workforce Reductions [Abstract] Workforce Reductions [Abstract] Workforce reductions Restructuring and Related Costs [Table Text Block] Fair Value of Long-Term Debt Recorded at Carrying Value [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value of Long-Term Debt Recorded at Carrying Value [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value of Long-Term Debt Recorded at Carrying Value Long-term Debt, Current and Noncurrent [Abstract] Carrying Value Long-term Debt Fair Value Long-term Debt, Fair Value Preferred And Preference Stock Of Utility Disclosure [Abstract] -- None. No documentation exists for this element. -- Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Preferred and Preference Stock of Utility Class of Stock [Line Items] Shares issued (in shares) Preferred Stock, Shares Issued Preference stock dividend rate (percent) Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Document And Entity Information [Abstract] Document And Entity Information [Abstract] -- None. No documentation exists for this element. -- Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Employee severance Employee Severance [Member] Employer contributions Defined Benefit Plan, Contributions by Employer Estimated future contributions in remainder of 2014 Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year Estimated cash severance payments Estimated Cash Severance Payments Estimated Cash Severance Payments Statement of Stockholders' Equity [Abstract] Schedule of Capitalization, Equity [Table] Schedule of Capitalization, Equity [Table] Schedule of Capitalization, Equity [Line Items] Schedule of Capitalization, Equity [Line Items] Schedule of changes in equity Schedule of Stockholders Equity [Table Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Less: Income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (loss) from continuing operations Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation, decommissioning and amortization Depreciation, Decommissioning and Amortization The current period expense charged against earnings on long-lived, physical assets used in the normal conduct of business and not intended for resale to allocate or recognize the cost of assets over their useful lives; and to record the reduction in book value of an intangible asset over the benefit period of such asset; and to record the costs of decontaminating and decommissioning of facilities. Regulatory impacts of net nuclear decommissioning trust earnings Regulatory Impact of Net Nuclear Decommissioning Trust Earnings Reflected in Accumulated Depreciation The regulatory impacts of the realized gains and losses and earnings associated with the nuclear decommissioning trust investments reflected in proceeds and purchases of nuclear decommissioning trust investments in investing activities. Deferred income taxes and investment tax credits Deferred Income Taxes and Tax Credits Other Other Noncash Income (Expense) Cash Portion of Settlement Payment Cash Portion of Settlement Payment Cash Portion of Settlement Payment Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Receivables Increase (Decrease) in Receivables Inventory Increase (Decrease) in Inventories Accounts payable Increase (Decrease) in Accounts Payable Other current assets and liabilities Increase (Decrease) in Accrued Liabilities Derivative assets and liabilities, net Increase (Decrease) in Derivative Assets and Liabilities, Net The net change during the reporting period in current and long-term derivative assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting agreements. Regulatory assets and liabilities, net Increase (Decrease) in Regulatory Assets and Liabilities Other noncurrent assets and liabilities Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Long-term debt issued, net of premium, discount, and issuance costs of $4 and $6 at respective dates (Edison International) and $2 and $6 at respective dates (Southern California Edison) Proceeds from Issuance of Long-term Debt Long-term debt matured or repurchased Repayments of Long-term Debt Bonds remarketed, net Bonds Remarketed, Net Bonds Remarketed, Net Preference stock issued, net Proceeds from Issuance of Preferred Stock and Preference Stock Preference stock redeemed Payments for Repurchase of Preferred Stock and Preference Stock Short-term debt financing, net Proceeds from (Repayments of) Short-term Debt Settlements of stock-based compensation, net Stock Based Compensation Settlement of stock-based awards, including the purchase and delivery of common stock, proceeds from stock option exercises, excess tax benefits and other. Dividends to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Dividends paid Payments of Ordinary Dividends, Common Stock Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Proceeds from sale of nuclear decommissioning trust investments Proceeds from Decommissioning Trust Fund Assets Purchases of nuclear decommissioning trust investments and other Payments to Acquire Investments to be Held in Decommissioning Trust Fund Other Payments for (Proceeds from) Other Investing Activities Net cash used by investing activities Net Cash Provided by (Used in) Investing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Congestion Revenue Rights Congestion revenue rights [Member] Congestion revenue rights [Member] Tolling Tolling [Member] Derivative instrument whose primary underlying risk is tied to tolling contracts. Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Market Simulation Model Market Approach Valuation Technique [Member] Option Model Option Model [Member] Option Model [Member] Unobservable Input [Axis] Unobservable Input [Axis] Unobservable Input [Axis] Unobservable Input [Domain] Unobservable Input [Domain] Unobservable Input [Domain] Load Forecast Load Forecast [Member] Load Forecast [Member] Power Prices Power Prices [Member] Power Prices [Member] Gas Prices Gas Prices [Member] Gas Prices [Member] Weighted Average Weighted Average [Member] Quantitative Information About Level 3 Measurements [Line Items] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair Value, Assets Fair Value, Liabilities Fair value inputs, power units (in megawatts) Fair Value Inputs, Power Units Fair Value Inputs, Power Units Fair Value Inputs, Price Level Fair Value Inputs, Price Level Fair Value Inputs, Price Level Expected volatility rate (as a percent) Fair Value Assumptions, Expected Volatility Rate Debt and Credit Agreements Debt Disclosure [Text Block] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Defined Benefit Plans Adjustment Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Increase (Decrease) in Accumulated Other Comprehensive Loss Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] -- None. No documentation exists for this element. -- Beginning balance Accumulated Other Comprehensive Income (Loss), Net of Tax Other comprehensive loss before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Reclassified from accumulated other comprehensive income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Other Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Ending Balance Other Income and Expenses [Abstract] Interest and Other Income and Expenses Schedule of Other Nonoperating Income (Expense) [Table Text Block] Supplemental Cash Flows Information Cash Flow, Supplemental Disclosures [Text Block] Consolidated Statements of Changes in Equity Stockholders' Equity Note Disclosure [Text Block] Investments, All Other Investments [Abstract] Other Investments [Table] Investment Holdings [Table] Other Investments [Line Items] Investment Holdings [Line Items] Contributions received for decommissioning trusts Decommissioning Trust Contributions Received Amount of contributions from customers into the decommissioning trusts. Proceeds from sale of securities Unrealized holding gains, net of losses Available For Sale Securities Gross Unrealized Gain Loss Accumulated In Investments Net amount of accumulated unrealized gains (losses) on investments in available-for-sale securities impacting investments. Represents the difference between the fair value and cost of investments in available-for-sale securities. Fair Value Measurements Fair Value Disclosures [Text Block] Summary of Significant Accounting Policies [Line Items] These concepts are used to disclose significant accounting policies associated with domain members defined in one or many axes to the table. Supply of electricity, area covered (square mile) Supply Of Electricity Area Covered Supply Of Electricity Area Covered Interest and Other Income and Expenses Other Income and Other Expense Disclosure [Text Block] Preferred and Preference Stock of Utility Preferred and Preference Stock of Utility Not Subject to Mandatory Redemption Disclosure [Text Block] Preferred and preference stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock and preference stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued and outstanding. Premiums Discounts and Issuance Costs of Long Term Debt Premiums Discounts and Issuance Costs of Long Term Debt Premiums Discounts and Issuance Costs of Long Term Debt Other Significant Noncash Transactions [Table] Other Significant Noncash Transactions [Table] Common Stock Common Stock [Member] Preferred Stock and Preference Stock Preferred Stock [Member] Other Significant Noncash Transactions [Line Items] Other Significant Noncash Transactions [Line Items] Cash payments (receipts) for interest and taxes: Supplemental Cash Flow Information [Abstract] Interest, net of amounts capitalized Interest Paid, Net Tax payments (refunds), net Income Taxes Paid, Net Dividends declared but not paid: Dividends [Abstract] Dividends declared but not paid Dividends Payable Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid Income Taxes Income Tax Disclosure [Text Block] Statement of Financial Position [Abstract] Summary of Trusts' Income Statements Variable Interest Entity, Condensed Income Statement [Table Text Block] Variable Interest Entities, Condensed Income Statement [Table Text Block] Other Income And Expense [Table] Other Income And Expense [Table] Other Income And Expense [Table] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] FERC-Approved Settlement Agreements FERC-Approved Settlement Agreements [Member] FERC-Approved Settlement Agreements [Member] Other Income And Expense [Line Items] Other Income And Expense [Line Items] [Line Items] for Other Income And Expense [Table] Litigation Settlement, Amount Litigation Settlement, Amount Litigation Settlement, Amount Included in Other Income Litigation Settlement, Amount Included in Other Income Litigation Settlement, Amount Included in Other Income Other income: Other Nonoperating Income [Abstract] -- None. No documentation exists for this element. -- Equity allowance for funds used during construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Increase in cash surrender value of life insurance policies Increase (Decrease) in Cash Surrender Value of Life Insurance Policies This element represents the net change during the reporting period in cash surrender value of life insurance policies. Interest income Interest Income, Other Other Other Income Excluding Competitive Power Generation This element represents other miscellaneous nonoperating income excluding competitive power generation. Total interest and other income Other Utility Income This element represents the utility income not otherwise defined. Other income Competitive Power Generation and Other Income This element represents the total other income from competitive power generation segment. Interest and other income Other Nonoperating Income Other expenses: Other Nonoperating Expenses [Abstract] -- None. No documentation exists for this element. -- Civic, political and related activities and donations Civic Political Related Activities and Donations This element represents civic, political and related activities and donations. Other Other Expense, Excluding Competitive Power Generation This element represents other miscellaneous nonoperating expenses excluding competitive power generation. Total other expenses Other Utility Expense This element represents the utility expenses not otherwise defined. Other expenses Competitive Power Generation and Other Expenses This element represents the total other expenses of competitive power generation segment. Total consolidated other expenses Other Nonoperating Expense Litigation Settlement, Amount Subject to Shareholder Incentive Litigation Settlement, Amount Subject to Shareholder Incentive Litigation Settlement, Amount Subject to Shareholder Incentive Other Investments Other Investments Disclosure [Text Block] This element represents the disclosure of other investments held by the entity for investment purposes not otherwise defined in the taxonomy. Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Assets [Abstract] Cash and cash equivalents Receivables, less allowances of $67 and $66 for uncollectible accounts at respective dates Receivables, Net, Current Accrued unbilled revenue Costs in Excess of Billings, Current Inventory Inventory, Net Derivative assets Regulatory assets Regulatory Assets, Current Deferred income taxes Deferred Tax Assets, Net, Current Other current assets Other Assets, Current Total current assets Assets, Current Other investments Other Long-term Investments Total investments Investments and Other Assets Sum of the carrying amounts as of the balance sheet date of investments and other assets that are expected to be realized in cash, sold, or consumed after one year or beyond the normal operating cycle, if longer. Utility property, plant and equipment, less accumulated depreciation of $7,774 and $7,493 at respective dates Public Utilities, Property, Plant and Equipment, Net Nonutility property, plant and equipment, less accumulated depreciation of $77 and $74 at respective dates (Edison International) and $72 and $70 (Southern California Edison) Property, Plant and Equipment, Other, Net Total property, plant and equipment Property, Plant and Equipment, Net Derivative assets Regulatory assets Regulatory Assets, Noncurrent Other long-term assets Other Assets, Noncurrent Total long-term assets Long-term Assets, Noncurrent Sum of the carrying amounts as of the balance sheet date of all assets that are expected to realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer, excluding Investments and other assets. Total assets Assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Short-term debt Current portion of long-term debt Long-term Debt, Current Maturities Accounts payable Accounts Payable, Current Accrued taxes Taxes Payable, Current Customer deposits Customer Deposits, Current Derivative liabilities Regulatory liabilities Regulatory Liability, Current Deferred income taxes Deferred Tax Liabilities, Net, Current Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Long-term debt Long-term Debt, Excluding Current Maturities Deferred income taxes and credits Deferred Tax Liabilities, Net, Noncurrent Derivative liabilities Pensions and benefits Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent Asset retirement obligations Asset Retirement Obligations, Noncurrent Regulatory liabilities Regulatory Liability, Noncurrent Other deferred credits and other long-term liabilities Other Liabilities, Noncurrent Total deferred credits and other liabilities Deferred Credits and Other Liabilities Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Common stock, no par value (800,000,000 shares authorized; 325,811,206 shares issued and outstanding at each date) and (560,000,000 shares authorized; 434,888,104 shares issued and outstanding at each date for SCE) Common Stocks, Including Additional Paid in Capital Additional paid-in capital Additional Paid In Capital Including Preference Stock Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees, including preference stock costs. Accumulated other comprehensive loss Retained earnings Retained Earnings (Accumulated Deficit) Total Edison International's common shareholders' equity Common Shareholder's Equity Total of common shareholder's equity items, net of receivables from officers, directors, owners and affiliates of the entity including portions attributable to the parent. Preferred and preference stock of utility Noncontrolling Interest, Amount Represented by Preferred Stock Total noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] EPS Attributable to Edison International Common Shareholders Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Changes in ARO Liability Schedule of Change in Asset Retirement Obligation [Table Text Block] Investment [Table] Investment [Table] Investment [Line Items] Investment [Line Items] Amortized Cost and Fair Value of the Trust Investments Schedule Of Amortized Cost And Fair Value Of Investments Held In Trust [Table Text Block] Schedule Of Amortized Cost And Fair Value Of Investments Held In Trust [Table Text Block] Summary of Changes in the Fair Value of Trust Summary Of Changes In Fair Value Of The Trust [Table Text Block] Summary of Changes in Fair Value of the Trust [Table Text Block] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] San Onofre Issues Plant Retirement and Abandonment [Text Block] Plant Retirement and Abandonment [Text Block] Energy derivatives Derivative Financial Instruments, Assets [Member] Deferred income taxes, net Deferred Income Tax Charge [Member] Other Other Regulated Assets Or Liabilities [Member] Miscellaneous regulatory assets and liabilities that are individually insignificant. Pensions and other postretirement benefits Pensions And Other Postretirement Benefits [Member] Carrying value of pension and other postretirement benefit costs under current regulatory conditions. These costs are a form of a regulatory asset that are expected to be recoverable through rate adjustments within one year (or the operating cycle, if longer). Unamortized investments, net Generation Investment [Member] The unamortized amount of generation plant investments as of the balance sheet date. Unamortized loss on reacquired debt Loss on Reacquired Debt [Member] Regulatory balancing accounts Costs of Removal Cost Of Removal [Member] Discloses the amount of regulatory liabilities related to cost of removal of assets. Asset Retirement Obligations Asset Retirement Obligation Costs [Member] Regulatory Assets Regulatory Asset [Abstract] -- None. No documentation exists for this element. -- Regulatory Assets, Current Regulatory Asset, Long-term Total Regulatory Assets Regulatory Assets Regulatory Liabilities Regulatory Liability [Abstract] -- None. No documentation exists for this element. -- Regulatory Liabilities, Current Regulatory Liabilities, Long-term Total Regulatory Liabilities Regulatory Liabilities Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Components of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Segments [Domain] Realized losses Realized Gains (Losses) on Economic Hedging Activities Realized gains and losses on hedging activities, which are recognized as purchased-power expense. Because the entity recovers these costs from rate payers, earnings are not affected, but cash flows may be temporarily affected. Unrealized losses Unrealized Gain (Loss) on Derivatives Aggregate fair value of all derivative liabilities with credit-risk-related contingent features Derivative, Net Liability Position, Aggregate Fair Value Potential amount of collateral to be posted if contingencies triggered Additional Collateral, Aggregate Fair Value Collateral already posted Additional Paid-in Capital Additional Paid-in Capital [Member] Common Stock Including Additional Paid in Capital Common Stock Including Additional Paid in Capital [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) [Member] Retained Earnings Retained Earnings [Member] Subtotal Parent [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, at the beginning of the period Net income (loss) Other comprehensive income (loss) Common stock dividends declared Dividends, Common Stock, Cash Dividends on preferred and preference stock Dividends Declared on Preferred and Preference Stock Not Subject to Mandatory Redemption Aggregate cash, stock, and paid-in-kind dividends declared for preferred and preference shareholders during the period. Dividends, distributions to noncontrolling interests and other Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Stock-based compensation and other Stock Issued During Period, Value, Share-based Compensation and Other Stock Issued During Period, Value, Share-based Compensation and Other Noncash stock-based compensation and other Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Issuance of preference stock Issuance of preference stock, during the period, value Issuance of preference stock, during the period, value Redemption of preference stock Redemption of preference stock, during the period, value Redemption of preference stock, during the period, value Balance, at the end of the period Dividends declared per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Summary Of Changes In The Fair Value [Roll Forward] Summary Of Changes In The Fair Value [Roll Forward] -- None. No documentation exists for this element. -- Balance at beginning of period Gross realized gains Decommissioning Trust Realized Gain on Investments This item represents the amount of realized gain on investments in trust during the period from the sale of securities. Gross realized losses Decommissioning Trust Realized Loss on Investments This item represents the amount of realized loss on investments in trust during the period from the sale of securities. Unrealized gains (losses), net Decommissioning Trust Unrealized Gains on Investments, Net This item represents the amount of net unrealized gain on investments in trust during the period. Other-than-temporary impairments Decommissioning Trust Other than Temporary Impairments Discloses the amount of other than temporary decline in value that has been recognized by the decommissioning trust during the period. Interest, dividends, contributions and other Decommissioning Trust Interest Dividends Contributions and Other Discloses the amount of interest, dividend, contribution and other receipts during the period. Balance at end of period Receivables, allowances for uncollectible accounts (in dollars) Allowance for Doubtful Accounts Receivable, Current Utility property, plant and equipment, accumulated depreciation (in dollars) Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Nonutility property, plant and equipment, accumulated depreciation (in dollars) Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Common stock, no par value (in dollars per share) 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 Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Edison Mission Energy Edison Mission Energy [Member] Represents Edison Mission Energy, which is the indirect parent of Midwest Generation, LLC. Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Discontinued Operations [Member] Discontinued Operations [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Liabilities For Joint Tax and Qualified Retirement Plans Resulting from Deconsolidation Liabilities For Joint Tax and Qualified Retirement Plans Resulting from Deconsolidation Liabilities For Joint Tax and Qualified Retirement Plans Resulting from Deconsolidation Percentage of Tax Benefits To Be Paid Percentage of Tax Benefits To Be Paid Percentage of Tax Benefits To Be Paid Tax Attributes Estimated Amount Tax Attributes Estimated Amount Tax Attributes Estimated Amount Cash Portion of Settlement Payment Number of Installments Number of Installments Number of Installments Interest Rate On Installments Interest Rate On Installments Interest Rate On Installments Tax Attribute Including Interest, Installment One Tax Attribute Including Interest, Installment One Tax Attribute Including Interest, Installment One Tax Attribute Including Interest Installment Two Tax Attribute Including Interest Installment Two Tax Attribute Including Interest Installment Two Variance, Initial Estimate, Tax Attribute Tax Attributes, Possible Variance From Initial Estimate Tax Attributes, Possible Variance From Initial Estimate Amount Required for Escrow Amount Required for Escrow Amount Required for Escrow Nondebtor Reorganization Items, Net (Gain) Loss on Settlement of Other Claims Nondebtor Reorganization Items, Net (Gain) Loss on Settlement of Other Claims Electricity options, swaps and forwards (GWh) Electricity Options Swaps And Forward Arrangements [Member] Represents the commodity derivative contracts such as options, swaps and forward arrangements for electricity. Natural gas options, swaps and forwards (Bcf) Natural Gas Options Swaps And Forwards Arrangement Bcf [Member] Represents the commodity derivative contracts such as options, swaps and forward arrangements for natural gas with a unit of measure of a billion cubic feet (Bcf). Congestion revenue rights (GWh) Tolling arrangements (GWh) Tolling Arrangements GWh [Member] The contractual agreements for the purchase of power from developers who have agreed to construct new generating resources. Notional volumes of derivative instruments Derivative, Nonmonetary Notional Amount Restructuring and Related Activities [Abstract] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Beginning balance Restructuring Reserve Additions Restructuring Charges Payments Payments for Restructuring Ending balance Statement of Comprehensive Income [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Pension and postretirement benefits other than pensions: Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] Net loss arising during the period plus amortization included in net income Other Comprehensive Income Pension Adjustment Net Gains Losses and Amortization Other Comprehensive Income Pension Adjustment Net Gains Losses and Amortization Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive income attributable to noncontrolling interests Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to Edison International Comprehensive Income (Loss), Net of Tax, Attributable to Parent Income Statement [Abstract] Operating revenue Revenues Fuel Fuel Costs Purchased power Cost of Purchased Power Operation and maintenance Other Cost and Expense, Operating Property and other taxes Property and Other Taxes Property and other taxes incurred that are directly related to operations of the business during the reporting period. Total operating expenses Costs and Expenses Operating income (loss) Operating Income (Loss) Interest expense Interest Expense Other expenses Income (loss) from continuing operations before income taxes Income tax expense (benefit) Income (loss) from continuing operations Income from discontinued operations, net of tax Preferred and preference stock dividend requirements of utility Dividends, Preferred Stock Net income (loss) attributable to Edison International common shareholders Net Income (Loss) Attributable to Parent Amounts attributable to common shareholders: Income Amounts Attributable to Parent, Disclosures [Abstract] Income (loss) from continuing operations, net of tax Net Income (Loss) Available to Common Stockholders, Basic Basic earnings (loss) per common share attributable to Edison International common shareholders: Earnings Per Share, Basic [Abstract] Weighted-average shares of common stock outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Total (in dollars per share) Earnings Per Share, Basic Diluted earnings (loss) per common share attributable to Edison International common shareholders: Earnings Per Share, Diluted [Abstract] Weighted-average shares of common stock outstanding, including effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Total (in dollars per share) Earnings Per Share, Diluted Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock-Based Compensation Awards Stock Compensation Plan [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Summary of Significant Accounting Policies Earnings Per Common Share Earnings Per Share [Abstract] Basic earnings per share - continuing operations: Basic Earnings Per Share Continuing Operations [Abstract] -- None. No documentation exists for this element. -- Weighted average common shares outstanding (in shares) Basic earnings per share – continuing operations (in dollars per share) Diluted earnings per share - continuing operations: Diluted Earnings Per Share Continuing Operations [Abstract] -- None. No documentation exists for this element. -- Income impact of assumed conversions Dilutive Securities, Effect on Basic Earnings Per Share Income from continuing operations available to common shareholders and assumed conversions Net Income (Loss) Available to Common Stockholders, Diluted Incremental shares from assumed conversions (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Adjusted weighted average shares - diluted (in shares) Diluted earnings per share – continuing operations (in dollars per share) Stock-based compensation awards excluded from the computation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount