| Finance Lease, Right-of-Use Asset, before Accumulated Amortization | 682.00M | as of 2025-12-31 |
| Current Federal Tax Expense (Benefit) | -565.00M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | -6.00M | 2025-01-01 → 2025-12-31 |
| Current Foreign Tax Expense (Benefit) | 2.00M | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | -569.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Legally Restricted Assets, Fair Value | 11.37B | as of 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | 1.10B | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 135.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Incurred | 18.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Settled | 584.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Liability, Current | 238.00M | as of 2025-12-31 |
| Asset Retirement Obligation, Revision of Estimate | -271.00M | 2025-01-01 → 2025-12-31 |
| Other Tax Expense (Benefit) | -25.00M | 2025-01-01 → 2025-12-31 |
| Prepaid Expense and Other Assets, Current | 526.00M | as of 2025-12-31 |
| Share-based Payment Arrangement, Amount Capitalized | 7.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense | 102.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expensed and Capitalized, Amount | 95.00M | 2025-01-01 → 2025-12-31 |
| Dividends | 3.29B | 2025-01-01 → 2025-12-31 |
| Participating Securities, Distributed and Undistributed Earnings (Loss), Basic | 6.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | 328.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 1.20B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 106.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense, after Tax | 74.00M | 2025-01-01 → 2025-12-31 |
| Energy Related Inventory, Coal | 715.00M | as of 2025-12-31 |
| Share-based Payment Arrangement, Expense, Tax Benefit | 21.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | -6.00M | 2025-01-01 → 2025-12-31 |
| Energy Related Inventory, Other Fossil Fuel | 312.00M | as of 2025-12-31 |
| Long-term Debt, Fair Value | 79.86B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 25.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | 23.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount | 46.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Amount | -466.00M | 2025-01-01 → 2025-12-31 |
| Interest Income (Expense), Nonoperating, Net | 51.00M | 2025-01-01 → 2025-12-31 |
| Equity Securities, FV-NI, Realized Gain | 1.17B | 2025-01-01 → 2025-12-31 |
| Equity Securities, FV-NI, Realized Loss | 145.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | -27.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Land | 2.67B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 10.07B | as of 2025-12-31 |
| Noncontrolling Interest, Decrease from Deconsolidation | 18.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Equipment | 4.19B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | -1.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 6.43B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Plant in Service | 190.41B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 60.45B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Net | 129.96B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Realized Gain | 67.00M | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Realized Loss | 77.00M | 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 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 108.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 1.13B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 955.00M | as of 2025-12-31 |
| Deferred Income Taxes and Other Tax Liabilities, Noncurrent | 12.38B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 2.25B | as of 2025-12-31 |
| Deferred Credits and Other Liabilities | 1.89B | as of 2025-12-31 |
| Regulatory Assets | 16.31B | as of 2025-12-31 |
| Regulatory Liabilities | 16.95B | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 120.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Cost | 283.00M | 2025-01-01 → 2025-12-31 |
| Goodwill, Impaired, Accumulated Impairment Loss | 0 | as of 2025-12-31 |
| Short-term Lease, Cost | 6.00M | 2025-01-01 → 2025-12-31 |
| Variable Lease, Cost | 39.00M | 2025-01-01 → 2025-12-31 |
| Lease, Cost | 432.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Inventory | 4.57B | as of 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Finance Lease Liability | 72.00M | 2025-01-01 → 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 348.00M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, Payment, Due | 927.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Other | 254.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months | 95.00M | as of 2025-12-31 |
| Accounts Receivable, Allowance for Credit Loss, Writeoff | 164.00M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Two | 88.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Three | 84.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Four | 81.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Five | 82.00M | as of 2025-12-31 |
| Regulated Operating Revenue, Electric, Non-Nuclear | 29.06B | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling after Year Five | 497.00M | as of 2025-12-31 |
| Regulated Operating Revenue, Gas | 2.87B | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, Undiscounted Excess Amount | 351.00M | as of 2025-12-31 |
| Unregulated Operating Revenue | 307.00M | 2025-01-01 → 2025-12-31 |
| Regulated and Unregulated Operating Revenue | 32.24B | 2025-01-01 → 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 1.57B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months | 289.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two | 239.00M | as of 2025-12-31 |
| Deferred Tax Assets, Other | 36.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three | 200.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four | 171.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five | 136.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five | 539.00M | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 130.00M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 4.10B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 303.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 16.48B | as of 2025-12-31 |
| Excise Taxes Collected | 447.00M | 2025-01-01 → 2025-12-31 |
| Debt Instrument, Face Amount | 7.00B | as of 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 12.63B | as of 2025-12-31 |
| Deferred Tax Liabilities, Regulatory Assets | 1.40B | as of 2025-12-31 |
| Assets, Fair Value Disclosure | 13.71B | as of 2025-12-31 |
| Deferred Tax Liabilities, Investments | 2.45B | as of 2025-12-31 |
| Fair Value, Net Asset (Liability) | 13.46B | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 12.38B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 7.12B | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 272.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 3.64B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 4.08B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 4.55B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 4.43B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 63.04B | as of 2025-12-31 |
| Debt Instrument, Unamortized Discount (Premium), Net | -762.00M | as of 2025-12-31 |
| Tax Credit Carryforward, Amount | 3.26B | as of 2025-12-31 |
| Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 921.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits | 72.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 2.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 67.00M | as of 2025-12-31 |
| Interest Rate Derivatives, at Fair Value, Net | -176.00M | as of 2025-12-31 |
| Income (Loss) from Continuing Operations before Income Taxes, Domestic | 5.67B | 2025-01-01 → 2025-12-31 |
| Income (Loss) from Continuing Operations before Income Taxes, Foreign | 38.00M | 2025-01-01 → 2025-12-31 |
| Allowance for Funds Used During Construction, Capitalized Interest | 182.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 9.00M | as of 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases | 14.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements | 6.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 | -7.00M | 2025-01-01 → 2025-12-31 |
| Derivative, Net Liability Position, Aggregate Fair Value | 102.00M | as of 2025-12-31 |
| Collateral Already Posted, Aggregate Fair Value | 2.00M | as of 2025-12-31 |
| Additional Collateral, Aggregate Fair Value | 100.00M | as of 2025-12-31 |
| Derivative Liability, Fair Value, Gross Liability | 244.00M | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Asset | 382.00M | as of 2025-12-31 |