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Derivative Financial Instruments - Summary of Derivative Fair Value Balances (Details) link:presentationLink link:calculationLink link:definitionLink 9954736 - Disclosure - Derivative Financial Instruments - Summary of Economic Hedges (Details) link:presentationLink link:calculationLink link:definitionLink 9954737 - Disclosure - Derivative Financial Instruments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954738 - Disclosure - Derivative Financial Instruments - Summary of Credit Risk Exposure (Details) link:presentationLink link:calculationLink link:definitionLink 9954739 - Disclosure - Derivative Financial Instruments - Summary of Credit Risk Related Contingent Features (Details) link:presentationLink link:calculationLink link:definitionLink 9954740 - Disclosure - Derivative Financial Instruments - Summary of Cash Collateral and Letters of Credit (Details) link:presentationLink link:calculationLink link:definitionLink 9954741 - Disclosure - Debt and Credit Agreements - 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Commitments and Contingencies - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954753 - Disclosure - Shareholders' Equity - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954754 - Disclosure - Shareholders' Equity - Schedule of Changes in AOCI (Details) link:presentationLink link:calculationLink link:definitionLink 9954755 - Disclosure - Shareholders' Equity - Income Taxes Allocated to Other Comprehensive Income (Loss) Components (Details) link:presentationLink link:calculationLink link:definitionLink 9954756 - Disclosure - Variable Interest Entities - Assets and Liabilities of Consolidated VIEs (Details) link:presentationLink link:calculationLink link:definitionLink 9954757 - Disclosure - Variable Interest Entities - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954758 - Disclosure - Variable Interest Entities - Summary of Significant Unconsolidated VIEs (Details) link:presentationLink link:calculationLink link:definitionLink 9954759 - Disclosure - Supplemental Financial Information - Summary of Taxes other than income (Details) link:presentationLink link:calculationLink link:definitionLink 9954760 - Disclosure - Supplemental Financial Information - Summary of Other Income (Expense) (Details) link:presentationLink link:calculationLink link:definitionLink 9954761 - Disclosure - Supplemental Financial Information - Supplemental Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954762 - Disclosure - Supplemental Financial Information - Supplemental Balance Sheet Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954763 - Disclosure - Related Party Transactions - Operating Revenues and Purchased Power and Fuel From Affiliates (Details) link:presentationLink link:calculationLink link:definitionLink 9954764 - Disclosure - Related Party Transactions - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink