0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 0000002 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Consolidated Statements of Operations and Comprehensive Income, Parent link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Consolidated Statements of Cash Flows, Parent link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Consolidated Balance Sheets, Parent link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Consolidated Balance Sheets, Parent (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Consolidated Statements of Changes in Shareholders Equity, Parent link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Consolidated Statements of Changes in Equity, Parent (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - Consolidated Statements of Operations and Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 9952158 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952159 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952160 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952161 - Statement - Consolidated Statements of Changes in Equity link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Mergers, Acquisitions, and Dispositions link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Regulatory Matters link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Revenue from Contracts with Customers link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Government Assistance link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Accounts Receivable link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Property, Plant, and Equipment link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Jointly-Owned Electric Plants link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Asset Retirement Obligations link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - Intangible Assets link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952175 - Disclosure - Retirement Benefits link:presentationLink link:calculationLink link:definitionLink 9952176 - 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Disclosure - Basis of Presentation (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Revenue from Contracts with Customers (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Accounts Receivable (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Property, Plant, and Equipment (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Jointly-Owned Electric Plants (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Asset Retirement Obligations (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Intangible Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Retirement Benefits (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Derivative Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Debt and Credit Agreements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Fair Value of Financial Assets and Liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Commitments and Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Shareholders' Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Stock-Based Compensation Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Variable Interest Entities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Supplemental Financial Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Basis of Presentation (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Mergers, Acquisitions, and Dispositions - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Regulatory Matters (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Revenue from Contracts with Customers - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Revenue from Contracts with Customers - Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Revenue from Contracts with Customers - Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Segment Information - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Segment Information - Generation Total Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Government Assistance (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Accounts Receivable - Balance Sheet Supplemental Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Accounts Receivable - Allowance for Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Accounts Receivable - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Accounts Receivable - Purchases and Sales of Accounts Receivable (Detail) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Property, Plant, and Equipment - Summary of Property, Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Property, Plant, and Equipment - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Jointly-Owned Electric Plants (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Asset Retirement Obligations - Nuclear Decommissioning Asset Retirement Obligation Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Asset Retirement Obligations - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Asset Retirement Obligations - Noncurrent Related Party Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Asset Retirement Obligations - Non-Nuclear Asset Retirement Obligations Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Leases - Lease Terms (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Leases - Components of Lease Cost (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Leases - Supplemental Balance Sheet Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Leases - Operating Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Lessee - Lessee Future Minimum Operating Lease Maturity Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Lessee - Lessee Future Minimum Operating Lease Maturity Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Leases - Supplemental Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Lessor - Components of Operating Lease Income (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Lessor - Operating Lease, Payments, Fiscal Year Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Intangible Assets - Schedule of Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Intangible Assets - Schedule of Other Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Intangible Assets - Summary of Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Income Taxes - Income (Loss) Before Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Income Taxes - Components of Income Tax Expense (Benefit) from Continuing Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Income Taxes - Income Taxes Paid (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Income Taxes - Reconciliation to Effective Tax Rate (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - Income Taxes - Tax Effects of Temporary Differences and Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 9955566 - Disclosure - Income Taxes - Schedule of Carryforwards and Corresponding Valuation Allowances (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - Income Taxes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955568 - Disclosure - Retirement Benefits - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955569 - Disclosure - Retirement Benefits - Benefit Obligation and Plan Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955570 - Disclosure - Retirement Benefits - Benefit Obligations Net of Plan Assets, Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 9955571 - Disclosure - Retirement Benefits - Accumulated Benefit Obligation (Details) link:presentationLink link:calculationLink link:definitionLink 9955572 - Disclosure - Retirement Benefits - Net Benefit Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955573 - Disclosure - Retirement Benefits - Changes in Plan Assets Recognized in AOCI (Details) link:presentationLink link:calculationLink link:definitionLink 9955574 - Disclosure - Retirement Benefits - Remaining Service Period (Details) link:presentationLink link:calculationLink link:definitionLink 9955575 - Disclosure - Retirement Benefits - Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 9955576 - Disclosure - Retirement Benefits - Contributions Made to Pension and Other Postretirement Benefit Plans (Details) link:presentationLink link:calculationLink link:definitionLink 9955577 - Disclosure - Retirement Benefits - Estimated Future Benefit Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9955578 - Disclosure - Retirement Benefits - Target Allocation (Details) link:presentationLink link:calculationLink link:definitionLink 9955579 - Disclosure - Retirement Benefits - Fair Value of Plan Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955580 - Disclosure - Derivative Financial Instruments - Summary of Derivative Fair Value Balances (Details) link:presentationLink link:calculationLink link:definitionLink 9955581 - Disclosure - Derivative Financial Instruments - Commodity Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 9955582 - Disclosure - Derivative Financial Instruments - Summary of Economic Hedges (Details) link:presentationLink link:calculationLink link:definitionLink 9955583 - Disclosure - Derivative Financial Instruments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955584 - Disclosure - Derivative Financial Instruments - Summary of Credit Risk Exposure (Details) link:presentationLink link:calculationLink link:definitionLink 9955585 - Disclosure - Derivative Financial Instruments - Summary of Credit Risk Related Contingent Features (Details) link:presentationLink link:calculationLink link:definitionLink 9955586 - Disclosure - Derivative Financial Instruments - Summary of Cash Collateral and Letters of Credit (Details) link:presentationLink link:calculationLink link:definitionLink 9955587 - Disclosure - Debt and Credit Agreements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955588 - Disclosure - Debt and Credit Agreements - Summary of Bank Commitments, Credit Facility Borrowings and Available Capacity (Details) link:presentationLink link:calculationLink link:definitionLink 9955589 - Disclosure - Debt and Credit Agreements - Summary of Credit Facility Thresholds (Details) link:presentationLink link:calculationLink link:definitionLink 9955590 - Disclosure - Debt and Credit Agreements - Short Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955591 - Disclosure - Debt and Credit Agreements - Summary of Outstanding Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955592 - Disclosure - Debt and Credit Agreements - Schedule of Long-term Debt Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 9955593 - Disclosure - Debt and Credit Agreements - Debt Issuance Under Exchange (Details) link:presentationLink link:calculationLink link:definitionLink 9955594 - Disclosure - Fair Value of Financial Assets and Liabilities - Fair Value of Financial Liabilities Recorded at Amortized Cost (Details) link:presentationLink link:calculationLink link:definitionLink 9955595 - Disclosure - Fair Value of Financial Assets and Liabilities - Fair Value Measurement of Assets and Liabilities, Recurring (Details) link:presentationLink link:calculationLink link:definitionLink 9955596 - Disclosure - Fair Value of Financial Assets and Liabilities - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955597 - Disclosure - Fair Value of Financial Assets and Liabilities - Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955598 - Disclosure - Fair Value of Financial Assets and Liabilities - Fair Value Assets and Liabilities Measure on a Recurring Basis Gain Loss Included in Earnings (Details) link:presentationLink link:calculationLink link:definitionLink 9955599 - Disclosure - Fair Value of Financial Assets and Liabilities - Fair Value Assets and Liabilities Measure on a Recurring Basis Gain Loss Included in Earnings (Details) link:presentationLink link:calculationLink link:definitionLink 9955600 - Disclosure - Fair Value of Financial Assets and Liabilities - Fair Value Inputs Assets Quantitative Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955601 - Disclosure - Commitments and Contingencies - Schedule of Commercial Commitments (Details) link:presentationLink link:calculationLink link:definitionLink 9955602 - Disclosure - Commitments and Contingencies - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955603 - Disclosure - Commitments and Contingencies - Settlement Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 9955604 - Disclosure - Commitments and Contingencies - Schedule of Spent Nuclear Fuel Obligation (Details) link:presentationLink link:calculationLink link:definitionLink 9955605 - Disclosure - Shareholders' Equity - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955606 - Disclosure - Shareholders' Equity - ASR Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 9955607 - Disclosure - Shareholders' Equity - Schedule of Changes in AOCI (Details) link:presentationLink link:calculationLink link:definitionLink 9955608 - Disclosure - Shareholders' Equity - Income Taxes Allocated to Other Comprehensive Income (Loss) Components (Details) link:presentationLink link:calculationLink link:definitionLink 9955609 - Disclosure - Stock-Based Compensation Plans - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955610 - Disclosure - Stock-Based Compensation Plans - Schedule of Stock-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955611 - Disclosure - Stock-Based Compensation Plans - Unit Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955612 - Disclosure - Stock-Based Compensation Plans - Unit Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955613 - Disclosure - Variable Interest Entities - Assets and Liabilities of Consolidated VIEs (Details) link:presentationLink link:calculationLink link:definitionLink 9955614 - Disclosure - Variable Interest Entities - 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