| Finance Lease, Right-of-Use Asset, before Accumulated Amortization | 0 | as of 2025-12-31 |
| Current Federal Tax Expense (Benefit) | 46.00M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | 53.00M | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | 99.00M | 2025-01-01 → 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | 172.00M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 27.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Incurred | 0 | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Settled | 26.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Liability, Current | 0 | as of 2025-12-31 |
| Asset Retirement Obligation, Revision of Estimate | 2.00M | 2025-01-01 → 2025-12-31 |
| Federal Income Tax Expense (Benefit), Continuing Operations | 216.00M | 2025-01-01 → 2025-12-31 |
| State and Local Income Tax Expense (Benefit), Continuing Operations | 75.00M | 2025-01-01 → 2025-12-31 |
| Dividends | 809.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | 81.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 309.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 75.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 17.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | 1.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Amount | 18.00M | 2025-01-01 → 2025-12-31 |
| Interest Income (Expense), Nonoperating, Net | 20.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Plant in Service | 42.95B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 10.30B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Net | 32.65B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 6.00M | 2025-01-01 → 2025-12-31 |
| Net Income (Loss) Available to Common Stockholders, Diluted | 1.18B | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 181.00M | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 26.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards | 35.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 99.00M | as of 2025-12-31 |
| Operating Lease, Cost | 0 | 2025-01-01 → 2025-12-31 |
| Short-term Lease, Cost | 0 | 2025-01-01 → 2025-12-31 |
| Lease, Cost | 0 | 2025-01-01 → 2025-12-31 |
| Public Utilities, Inventory | 551.00M | as of 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 | 0 | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year One | 0 | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Two | 0 | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Three | 0 | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Four | 0 | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Five | 0 | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, after Year Five | 0 | as of 2025-12-31 |
| Finance Lease, Liability, Payment, Due | 0 | as of 2025-12-31 |
| Deferred Tax Assets, Goodwill and Intangible Assets | 67.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 0 | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 0 | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 0 | as of 2025-12-31 |
| Deferred Tax Assets, Regulatory Assets and Liabilities | 186.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 0 | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 0 | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 0 | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 0 | as of 2025-12-31 |
| Deferred Tax Assets, Other | 130.00M | as of 2025-12-31 |
| Utilities Operating Expense, Taxes | 423.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 184.00M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 1.18B | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 4.67B | as of 2025-12-31 |
| Utilities Operating Expense | 6.91B | 2025-01-01 → 2025-12-31 |
| Long-term Debt, Gross | 19.09B | as of 2025-12-31 |
| Debt Instrument, Repurchase Amount | 84.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 4.11B | as of 2025-12-31 |
| Deferred Tax Liabilities, Prepaid Expenses | 49.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Regulatory Assets | 432.00M | as of 2025-12-31 |
| Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | -20.00M | 2025-01-01 → 2025-12-31 |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Liabilities, Goodwill | 52.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Other | 37.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 3.50B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 904.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 428.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 1.35B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 116.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 2.18B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 14.11B | as of 2025-12-31 |
| Debt Instrument, Unamortized Discount (Premium), Net | -58.00M | as of 2025-12-31 |
| Debt Issuance Costs, Gross | 137.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year Five | 4.00M | as of 2025-12-31 |
| Unbilled Contracts Receivable | 558.00M | as of 2025-12-31 |
| Capitalized Interest Costs, Including Allowance for Funds Used During Construction | 32.00M | 2025-01-01 → 2025-12-31 |
| Additional Collateral, Aggregate Fair Value | 5.00M | as of 2025-12-31 |