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Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 1001000 - Statement - Condensed Consolidated Statements of Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 2109100 - Disclosure - Contingencies (Notes) link:presentationLink link:calculationLink link:definitionLink 2209201 - Disclosure - Contingencies (Policies) link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 2407402 - Disclosure - Earnings Per Share Components of Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - Earnings Per Share Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 2107100 - 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Disclosure - Fair Value of Financial Instruments (Notes) link:presentationLink link:calculationLink link:definitionLink 2205201 - Disclosure - Fair Value of Financial Instruments (Policies) link:presentationLink link:calculationLink link:definitionLink 2305302 - Disclosure - Fair Value of Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 2405405 - Disclosure - Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 2110100 - Disclosure - Guarantees (Notes) link:presentationLink link:calculationLink link:definitionLink 2210201 - Disclosure - Guarantees (Policies) link:presentationLink link:calculationLink link:definitionLink 2406408 - Disclosure - Price Risk Management Counterparties Representing 10% or More (Details) link:presentationLink link:calculationLink link:definitionLink 2406408 - Disclosure - Price Risk Management Counterparties Representing 10% or More (Details) link:presentationLink link:calculationLink link:definitionLink 2406403 - Disclosure - Price Risk Management Fair values of price risk management assets and liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2406403 - Disclosure - Price Risk Management Fair values of price risk management assets and liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2406407 - Disclosure - Price Risk Management Future Year Net Unrealized Gain/Loss Recorded at Balance Sheet Date Expected to Become Realized (Details) link:presentationLink link:calculationLink link:definitionLink 2406406 - Disclosure - Price Risk Management Net realized and unrealized gains and losses on derivative transactions (Details) link:presentationLink link:calculationLink link:definitionLink 2406404 - Disclosure - Price Risk Management Net volumes related to price risk management activities (Details) link:presentationLink link:calculationLink link:definitionLink 2106100 - Disclosure - Price Risk Management (Notes) link:presentationLink link:calculationLink link:definitionLink 2206201 - Disclosure - Price Risk Management (Policies) link:presentationLink link:calculationLink link:definitionLink 2406405 - Disclosure - Price Risk Management Price Risk Management assets and liabilities subject to master netting agreements (Details) link:presentationLink link:calculationLink link:definitionLink 2406409 - Disclosure - Price Risk Management Price Risk Management (Details) link:presentationLink link:calculationLink link:definitionLink 2306302 - Disclosure - Price Risk Management (Tables) link:presentationLink link:calculationLink link:definitionLink 2408402 - Disclosure - Schedule of Equity (Details) link:presentationLink link:calculationLink link:definitionLink