| Current Federal Tax Expense (Benefit) | 77.50M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | 37.50M | 2025-01-01 → 2025-12-31 |
| Accrual for Environmental Loss Contingencies | 154.30M | as of 2025-12-31 |
| Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses | 40.50M | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | 115.00M | 2025-01-01 → 2025-12-31 |
| Accrual for Environmental Loss Contingencies, Payments | 14.20M | 2025-01-01 → 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | 63.70M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | -36.40M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Settled | 24.20M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Liability, Current | 10.00M | as of 2025-12-31 |
| Asset Retirement Obligation, Revision of Estimate | -5.30M | 2025-01-01 → 2025-12-31 |
| Tax Adjustments, Settlements, and Unusual Provisions | -2.00M | 2025-01-01 → 2025-12-31 |
| Investments, Fair Value Disclosure | 320.70M | as of 2025-12-31 |
| Inventory, Gross | 491.60M | as of 2025-12-31 |
| Share-based Payment Arrangement, Expense | 33.60M | 2025-01-01 → 2025-12-31 |
| Equity Method Investment, Other than Temporary Impairment | 284.00M | 2025-01-01 → 2025-12-31 |
| Deferred Compensation Cash-based Arrangements, Liability, Classified, Noncurrent | 29.90M | as of 2025-12-31 |
| Dividends, Preferred Stock | 7.52M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | 99.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 386.40M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 2.40M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense, Tax Benefit | 8.80M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount | 22.60M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 30.90M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount | -23.40M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Amount | -50.60M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Generation or Processing | 206.80M | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Transmission | 17.08B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Distribution | 22.70B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 3.16B | as of 2025-12-31 |
| Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment | 12.78B | as of 2025-12-31 |
| SegmentExpenditureAdditionToLongLivedAssets | 4.16B | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 2.48B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Plant in Service | 54.93B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 12.16B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Net | 45.93B | as of 2025-12-31 |
| Dividends, Common Stock | 1.12B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount | 59.50M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | -241.60M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 30.20M | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 15.70M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 39.90M | as of 2025-12-31 |
| Guarantor Obligations, Current Carrying Value | 1.30M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 26.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 74.90M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 15.80M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 40.60M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 26.10M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 72.90M | as of 2025-12-31 |
| Regulatory Assets | 7.69B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 700.00K | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1.80M | as of 2025-12-31 |
| Regulatory Liabilities | 5.54B | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards | 314.00M | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 470.95M | 2025-01-01 → 2025-12-31 |
| Amount of Regulatory Costs Not yet Approved | 244.20M | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation, to be Paid, Year One | 1.78B | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two | 1.87B | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three | 1.76B | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four | 1.59B | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five | 1.20B | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five | 14.31B | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation | 22.51B | as of 2025-12-31 |
| Liability, Defined Benefit Plan, Current | 13.30M | as of 2025-12-31 |
| Operating Lease, Cost | 13.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 273.00M | as of 2025-12-31 |
| Variable Lease, Cost | 18.60M | 2025-01-01 → 2025-12-31 |
| Lease, Cost | 44.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | 151.90M | as of 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Finance Lease Liability | 19.70M | 2025-01-01 → 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 1.40M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year One | 27.90M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Two | 8.20M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Three | 7.50M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Four | 7.30M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Five | 7.30M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, after Year Five | 43.10M | as of 2025-12-31 |
| Finance Lease, Liability, Payment, Due | 101.30M | as of 2025-12-31 |
| Accounts Receivable, Allowance for Credit Loss, Writeoff | 216.10M | 2025-01-01 → 2025-12-31 |
| Accounts Receivable, Allowance for Credit Loss, Recovery | 17.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Derivative Instruments | 205.80M | as of 2025-12-31 |
| Finance Lease, Liability, Undiscounted Excess Amount | 19.60M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 11.50M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 7.10M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 6.80M | as of 2025-12-31 |
| Deferred Tax Assets, Regulatory Assets and Liabilities | 716.70M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 4.70M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 4.30M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 22.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 56.40M | as of 2025-12-31 |
| Deferred Tax Assets, Equity Method Investments | 760.30M | as of 2025-12-31 |
| Deferred Tax Assets, Other | 229.60M | as of 2025-12-31 |
| Utilities Operating Expense, Maintenance and Operations | 2.07B | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Gross | 3.40B | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 293.40M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 3.10B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 9.00M | as of 2025-12-31 |
| Utilities Operating Expense, Other | 6.08B | 2025-01-01 → 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 5.88B | as of 2025-12-31 |
| Marketable Securities, Unrealized Gain (Loss) | -700.00K | 2025-01-01 → 2025-12-31 |
| Deferred Tax Liabilities, Other | 113.20M | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 8.75B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 1.39B | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 68.60M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 2.89B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 2.28B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 2.30B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 2.90B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 16.59B | as of 2025-12-31 |
| Unrecognized Tax Benefits | 98.20M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 5.90M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 11.90M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 13.30M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Interest on Income Taxes Expense | 2.40M | 2025-01-01 → 2025-12-31 |
| Pension and Other Postretirement Benefits Cost (Reversal of Cost) | -80.63M | 2025-01-01 → 2025-12-31 |
| Income Tax Examination, Penalties and Interest Accrued | 4.10M | as of 2025-12-31 |
| Income (Loss) from Continuing Operations before Income Taxes, Domestic | 1.84B | 2025-01-01 → 2025-12-31 |
| Allowance for Funds Used During Construction, Capitalized Interest | 64.10M | 2025-01-01 → 2025-12-31 |
| Sale of Stock, Consideration Received on Transaction | 465.40M | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Amortized Cost | 156.50M | as of 2025-12-31 |