| Current Federal Tax Expense (Benefit) | 87.91M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | 10.89M | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | 98.81M | 2025-01-01 → 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | -11.07M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 18.99M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Incurred | 14.65M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Settled | 16.57M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Liability, Current | 188.59M | as of 2025-12-31 |
| Other Inventory, Supplies, Gross | 546.33M | as of 2025-12-31 |
| Asset Retirement Obligation, Revision of Estimate | 61.08M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense | 27.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | 61.15M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 155.06M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 23.61M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense, Tax Benefit | 12.00M | 2025-01-01 → 2025-12-31 |
| Energy Related Inventory, Other Fossil Fuel | 18.82M | as of 2025-12-31 |
| Long-term Debt, Fair Value | 9.16B | as of 2025-12-31 |
| EffectiveIncomeTaxRateReconciliationTaxCreditEnergyRelatedAmount | 14.70M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 42.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | 19.00K | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | 5.90M | 2025-01-01 → 2025-12-31 |
| Noncontrolling Interest, Decrease from Deconsolidation | 59.62M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | 1.52M | 2025-01-01 → 2025-12-31 |
| Dividends, Common Stock, Cash | 432.67M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Net | 20.72B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount | 3.17M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 0 | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 0 | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount | -4.06M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 1.54M | 2025-01-01 → 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year One | 109.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Two | 75.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Three | 45.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Four | 26.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Five | 14.00M | as of 2025-12-31 |
| Deferred Credits and Other Liabilities | 10.58B | as of 2025-12-31 |
| Regulatory Assets | 1.75B | as of 2025-12-31 |
| Regulatory Liabilities | 1.95B | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 109.75M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 46.61M | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation | 11.40B | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits | 56.45M | as of 2025-12-31 |
| Operating Lease, Cost | 314.75M | 2025-01-01 → 2025-12-31 |
| Short-term Lease, Cost | 2.25M | 2025-01-01 → 2025-12-31 |
| Variable Lease, Cost | 124.71M | 2025-01-01 → 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 2.20B | 2025-01-01 → 2025-12-31 |
| Decommissioning Fund Investments, Fair Value | 1.41B | as of 2025-12-31 |
| Nuclear Fuel, Net of Amortization | 104.27M | as of 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | 27.00M | 2025-01-01 → 2025-12-31 |
| Accounts Receivable, Allowance for Credit Loss, Writeoff | 27.96M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Derivative Instruments | 8.42M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 385.34M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 409.12M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 410.37M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 412.32M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 412.23M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 3.65B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 5.68B | as of 2025-12-31 |
| Deferred Tax Assets, Other | 49.10M | as of 2025-12-31 |
| Utilities Operating Expense, Maintenance and Operations | 1.19B | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 1.65B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 1.94B | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 4.12B | as of 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 2.60B | as of 2025-12-31 |
| Assets, Fair Value Disclosure | 1.86B | as of 2025-12-31 |
| Deferred Tax Liabilities, Derivatives | 2.07M | as of 2025-12-31 |
| Recorded Unconditional Purchase Obligation | 159.59M | as of 2025-12-31 |
| Deferred Tax Liabilities, Other | 54.42M | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 2.47B | as of 2025-12-31 |
| Unrecognized Tax Benefits | 125.44M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 2.82M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 81.29M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0 | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 970.00K | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Interest on Income Taxes Expense | 3.61M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 7.99M | as of 2025-12-31 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 103.78M | as of 2025-12-31 |
| Income Taxes Receivable, Current | 5.98M | as of 2025-12-31 |
| Pension and Other Postretirement Benefits Cost (Reversal of Cost) | -12.42M | 2025-01-01 → 2025-12-31 |
| Sale Leaseback Transaction, Accumulated Depreciation | 110.89M | as of 2025-12-31 |
| Sale of Stock, Consideration Received on Transaction | 198.18M | 2025-01-01 → 2025-12-31 |
| Credit Risk Derivative Assets, at Fair Value | 5.14M | as of 2025-12-31 |