| Current Federal Tax Expense (Benefit) | -269.00M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | -3.00M | 2025-01-01 → 2025-12-31 |
| Current Foreign Tax Expense (Benefit) | 2.00M | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | -270.00M | 2025-01-01 → 2025-12-31 |
| Capitalized Computer Software, Accumulated Amortization | 474.00M | as of 2025-12-31 |
| Cash and Cash Equivalents, Fair Value Disclosure | 176.00M | as of 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | 253.00M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 105.00M | 2025-01-01 → 2025-12-31 |
| Capitalized Computer Software, Amortization | 164.00M | 2025-01-01 → 2025-12-31 |
| Deferred Foreign Income Tax Expense (Benefit) | 0 | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Incurred | 32.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Settled | 10.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Liability, Current | 32.00M | as of 2025-12-31 |
| Asset Retirement Obligation, Revision of Estimate | 177.00M | 2025-01-01 → 2025-12-31 |
| Federal Income Tax Expense (Benefit), Continuing Operations | -16.00M | 2025-01-01 → 2025-12-31 |
| State and Local Income Tax Expense (Benefit), Continuing Operations | 102.00M | 2025-01-01 → 2025-12-31 |
| Foreign Income Tax Expense (Benefit), Continuing Operations | 2.00M | 2025-01-01 → 2025-12-31 |
| Other Assets, Miscellaneous, Noncurrent | 441.00M | as of 2025-12-31 |
| Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 96.00M | as of 2025-12-31 |
| DerivativeAssetAfterOffsetSubjectToMasterNettingArrangement | 232.00M | as of 2025-12-31 |
| Participating Securities, Distributed and Undistributed Earnings (Loss), Basic | 3.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | 105.00M | 2025-01-01 → 2025-12-31 |
| Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | 475.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 326.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 81.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | 1.00M | 2025-01-01 → 2025-12-31 |
| Energy Related Inventory | 381.00M | as of 2025-12-31 |
| Other Sundry Liabilities, Noncurrent | 224.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 94.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 67.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | 5.00M | 2025-01-01 → 2025-12-31 |
| Contract with Customer, Liability, Revenue Recognized | 134.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | 6.00M | 2025-01-01 → 2025-12-31 |
| Hosting Arrangement, Service Contract, Implementation Cost, Expense, Amortization | 13.00M | 2025-01-01 → 2025-12-31 |
| Line of Credit Facility, Maximum Borrowing Capacity | 3.85B | as of 2025-12-31 |
| Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, before Accumulated Amortization | 94.00M | as of 2025-12-31 |
| Line of Credit Facility, Remaining Borrowing Capacity | 2.22B | as of 2025-12-31 |
| Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, Accumulated Amortization | 40.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | 0 | 2025-01-01 → 2025-12-31 |
| SegmentReportingOtherItemAmount | 11.42B | 2025-01-01 → 2025-12-31 |
| Dividends, Common Stock, Cash | 921.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 16.00M | 2025-01-01 → 2025-12-31 |
| Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted | 3.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 7.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | -4.00M | 2025-01-01 → 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year One | 24.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Two | 24.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Three | 24.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Four | 24.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Five | 22.00M | as of 2025-12-31 |
| DerivativeLiabilityAfterOffsetSubjectToMasterNettingArrangement | 152.00M | as of 2025-12-31 |
| Intangible Assets, Gross (Excluding Goodwill) | 325.00M | as of 2025-12-31 |
| Net Income (Loss) Available to Common Stockholders, Diluted | 1.46B | 2025-01-01 → 2025-12-31 |
| Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | 445.00M | as of 2025-12-31 |
| Regulatory Assets | 7.55B | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 180.00M | as of 2025-12-31 |
| Regulatory Liabilities | 2.99B | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 51.00M | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 34.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards, General Business | 1.60B | as of 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards | 1.62B | as of 2025-12-31 |
| Goodwill, Period Increase (Decrease) | 0 | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal | 69.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff | 116.00M | 2025-01-01 → 2025-12-31 |
| FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery | 37.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Cost | 23.00M | 2025-01-01 → 2025-12-31 |
| Short-term Lease, Cost | 19.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 3.00M | as of 2025-12-31 |
| Variable Lease, Cost | 17.00M | 2025-01-01 → 2025-12-31 |
| Lease, Cost | 64.00M | 2025-01-01 → 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Finance Lease Liability | 0 | 2025-01-01 → 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 95.00M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year One | 5.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Two | 4.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Three | 4.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Four | 1.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Five | 1.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, after Year Five | 5.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payment, Due | 20.00M | as of 2025-12-31 |
| Finance Lease, Liability, Undiscounted Excess Amount | 2.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 37.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 35.00M | as of 2025-12-31 |
| Regulated Operating Revenue | 8.85B | 2025-01-01 → 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 32.00M | as of 2025-12-31 |
| Unregulated Operating Revenue | 6.96B | 2025-01-01 → 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 21.00M | as of 2025-12-31 |
| Regulated and Unregulated Operating Revenue | 15.81B | 2025-01-01 → 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 13.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 400.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 538.00M | as of 2025-12-31 |
| Utilities Operating Expense, Products and Services | 2.21B | 2025-01-01 → 2025-12-31 |
| Derivative, Collateral, Right to Reclaim Cash | 20.00M | as of 2025-12-31 |
| Deferred Tax Assets, Other | 182.00M | as of 2025-12-31 |
| Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 5.00M | as of 2025-12-31 |
| Derivative, Collateral, Obligation to Return Cash | 28.00M | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 46.00M | as of 2025-12-31 |
| Derivative Asset, Collateral, Obligation to Return Cash, Offset | 35.00M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 2.58B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 271.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 5.97B | as of 2025-12-31 |
| Debt Instrument, Face Amount | 4.46B | as of 2025-12-31 |
| Property Subject to or Available for Operating Lease, Accumulated Depreciation | 126.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 3.95B | as of 2025-12-31 |
| Assets, Fair Value Disclosure | 3.09B | as of 2025-12-31 |
| Deferred Tax Liabilities, Regulatory Assets and Liabilities | 1.41B | as of 2025-12-31 |
| Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | -14.00M | 2025-01-01 → 2025-12-31 |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | -1.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Liabilities, Investment in Noncontrolled Affiliates | 25.00M | as of 2025-12-31 |
| Financial and Nonfinancial Liabilities, Fair Value Disclosure | 152.00M | as of 2025-12-31 |
| Fair Value, Net Asset (Liability) | 2.94B | as of 2025-12-31 |
| Operating Lease, Lease Income, Lease Payments | 15.00M | 2025-01-01 → 2025-12-31 |
| Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease | 8.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Liabilities, Net | 3.40B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 1.35B | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 80.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 1.73B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 1.99B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 1.96B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 2.50B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 15.77B | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year One | 3.62B | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year Two | 1.57B | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year Three | 680.00M | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year Four | 417.00M | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year Five | 400.00M | as of 2025-12-31 |
| Purchase Obligation, to be Paid, after Year Five | 2.40B | as of 2025-12-31 |
| Purchase Obligation | 9.09B | as of 2025-12-31 |
| Operating Lease, Variable Lease Income | 46.00M | 2025-01-01 → 2025-12-31 |
| Tax Credit Carryforward, Valuation Allowance | 16.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits | 0 | as of 2025-12-31 |
| Unrecognized Tax Benefits, Interest on Income Taxes Expense | 0 | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 0 | as of 2025-12-31 |
| Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year One | 11.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year Two | 10.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year Three | 6.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year Four | 6.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year Five | 6.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, after Year Five | 23.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payments to be Received | 62.00M | as of 2025-12-31 |
| Income (Loss) from Continuing Operations before Income Taxes, Domestic | 1.54B | 2025-01-01 → 2025-12-31 |
| Income (Loss) from Continuing Operations before Income Taxes, Foreign | 7.00M | 2025-01-01 → 2025-12-31 |
| Other Receivables, Net, Current | 118.00M | as of 2025-12-31 |
| Capitalized Interest Costs, Including Allowance for Funds Used During Construction | 152.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 4.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 19.00M | as of 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings | 308.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements | 325.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 | 2.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 | 2.00M | 2025-01-01 → 2025-12-31 |
| Derivative, Net Liability Position, Aggregate Fair Value | 491.00M | as of 2025-12-31 |
| Collateral Already Posted, Aggregate Fair Value | 3.00M | as of 2025-12-31 |
| Additional Collateral, Aggregate Fair Value | 483.00M | as of 2025-12-31 |
| Derivative Liability, Fair Value, Gross Liability | 597.00M | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Asset | 707.00M | as of 2025-12-31 |