| Current Federal Tax Expense (Benefit) | 99.00M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | 14.00M | 2025-01-01 → 2025-12-31 |
| Accrual for Environmental Loss Contingencies | 42.00M | as of 2025-12-31 |
| Current Income Tax Expense (Benefit) | 113.00M | 2025-01-01 → 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | 597.00M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 147.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Incurred | 23.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Settled | 110.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Revision of Estimate | -57.00M | 2025-01-01 → 2025-12-31 |
| Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 509.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 761.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 130.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax and Other Liabilities, Noncurrent | 5.17B | as of 2025-12-31 |
| Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination | 0 | 2025-01-01 → 2025-12-31 |
| Other Liabilities and Deferred Revenue, Noncurrent | 4.99B | as of 2025-12-31 |
| Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress | 86.00M | 2025-01-01 → 2025-12-31 |
| Contract with Customer, Asset, Reclassified to Receivable | 58.00M | 2025-01-01 → 2025-12-31 |
| Contract with Customer, Liability, Revenue Recognized | 307.00M | 2025-01-01 → 2025-12-31 |
| Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination | 23.00M | 2025-01-01 → 2025-12-31 |
| Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress | -198.00M | 2025-01-01 → 2025-12-31 |
| Property, Plant and Equipment, Additions | 5.38B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | -34.00M | 2025-01-01 → 2025-12-31 |
| Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net | -40.00M | 2025-01-01 → 2025-12-31 |
| Dividends, Common Stock, Cash | 2.44B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 0 | 2025-01-01 → 2025-12-31 |
| Revenue, Remaining Performance Obligation, Amount | 32.17B | as of 2025-12-31 |
| Treasury Stock, Value, Acquired, Cost Method | 0 | 2025-01-01 → 2025-12-31 |
| Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic | 2.62B | 2025-01-01 → 2025-12-31 |
| Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic | 0 | 2025-01-01 → 2025-12-31 |
| Capitalized Contract Cost, Amortization | -17.00M | 2025-01-01 → 2025-12-31 |
| Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain | 0 | 2025-01-01 → 2025-12-31 |
| Intangible Assets, Net (Including Goodwill) | 6.76B | as of 2025-12-31 |
| Regulatory Assets | 698.00M | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 224.00M | as of 2025-12-31 |
| Regulatory Liabilities | 1.32B | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 171.00M | as of 2025-12-31 |
| Net Regulatory Assets | -99.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 203.00M | as of 2025-12-31 |
| Stockholders' Equity, Period Increase (Decrease) | 155.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Cost | 39.00M | 2025-01-01 → 2025-12-31 |
| Variable Lease, Cost | 33.00M | 2025-01-01 → 2025-12-31 |
| Lease, Cost | 72.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 1.14B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 40.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 36.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 28.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 25.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 21.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 87.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 237.00M | as of 2025-12-31 |
| Deferred Tax Assets, Other | 127.00M | as of 2025-12-31 |
| Deferred Tax Asset, Interest Carryforward | 117.00M | as of 2025-12-31 |
| Deferred Tax Assets, Gross | 1.98B | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 83.00M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 1.90B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 54.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 7.07B | as of 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 5.12B | as of 2025-12-31 |
| Debt, Long-term and Short-term, Combined Amount | 28.66B | as of 2025-12-31 |
| Deferred Tax Liabilities, Investment in Noncontrolled Affiliates | 1.72B | as of 2025-12-31 |
| Deferred Tax Liabilities, Other | 237.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 5.17B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 1.34B | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 74.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 1.99B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 1.70B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 1.60B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 2.50B | as of 2025-12-31 |
| Interest Costs Capitalized | 62.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | -15.00M | as of 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings | 50.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements | -31.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 | -78.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 | -4.00M | 2025-01-01 → 2025-12-31 |
| Collateral Already Posted, Aggregate Fair Value | 189.00M | as of 2025-12-31 |
| Additional Collateral, Aggregate Fair Value | 30.00M | as of 2025-12-31 |