| Current Federal Tax Expense (Benefit) | 33.00M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | -49.00M | 2025-01-01 → 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | 414.00M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 182.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Settled | 77.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Liability, Current | 123.00M | as of 2025-12-31 |
| Asset Retirement Obligation, Revision of Estimate | 84.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Period Increase (Decrease) | -64.00M | 2025-01-01 → 2025-12-31 |
| Tax Adjustments, Settlements, and Unusual Provisions | -6.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0 | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense | 55.00M | 2025-01-01 → 2025-12-31 |
| Other Assets, Miscellaneous, Noncurrent | 390.00M | as of 2025-12-31 |
| Deferred Compensation Plan Assets | 125.00M | as of 2025-12-31 |
| Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | 69.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 545.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 140.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense, Tax Benefit | 15.00M | 2025-01-01 → 2025-12-31 |
| Long-term Debt, Fair Value | 25.55B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount | 10.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 0 | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | 5.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 3.41B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Common | 4.58B | as of 2025-12-31 |
| SegmentExpenditureAdditionToLongLivedAssets | 5.00B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | 0 | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Plant in Service | 68.45B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 16.46B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Net | 55.40B | as of 2025-12-31 |
| Dividends, Common Stock | 1.21B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | -13.00M | 2025-01-01 → 2025-12-31 |
| Guarantor Obligations, Maximum Exposure, Undiscounted | 60.00M | as of 2025-12-31 |
| Derivative, Fair Value, Net | 173.00M | as of 2025-12-31 |
| Deferred Credits and Other Liabilities, Noncurrent | 548.00M | as of 2025-12-31 |
| Contract with Customer, Refund Liability, Current | 498.00M | as of 2025-12-31 |
| Defined Benefit Plan, Plan Assets, Amount | 620.00M | as of 2025-12-31 |
| Impairment of Intangible Assets (Excluding Goodwill) | 0 | 2025-01-01 → 2025-12-31 |
| Regulatory Assets | 5.70B | as of 2025-12-31 |
| Regulatory Liabilities | 5.62B | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards | 51.00M | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 1.31B | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 205.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards | 241.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | 245.00M | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation | 442.00M | as of 2025-12-31 |
| Operating Lease, Cost | 69.00M | 2025-01-01 → 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 46.00M | 2025-01-01 → 2025-12-31 |
| Plant Held for Future Use Amount | 77.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payment, Due | 3.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months | 1.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense | 88.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Two | 1.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Three | 1.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Four | 0 | as of 2025-12-31 |
| Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) | -507.00M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling Year Five | 0 | as of 2025-12-31 |
| Finance Lease, Liability, Payments, Due in Rolling after Year Five | 0 | as of 2025-12-31 |
| Finance Lease, Liability, Undiscounted Excess Amount | 0 | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 632.00M | as of 2025-12-31 |
| Deferred Tax Assets, Equity Method Investments | 68.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months | 73.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two | 71.00M | as of 2025-12-31 |
| Deferred Tax Assets, Other | 0 | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three | 66.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four | 67.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five | 64.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five | 291.00M | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 12.00M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 2.86B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 132.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 12.46B | as of 2025-12-31 |
| Excise Taxes Collected | 464.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 9.70B | as of 2025-12-31 |
| Deferred Tax Liabilities, Investment in Noncontrolled Affiliates | 24.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Other | 3.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 9.62B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 250.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 780.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 800.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 44.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 635.00M | as of 2025-12-31 |
| Capitalization, Long-term Debt and Equity | 49.74B | as of 2025-12-31 |
| Debt Instrument, Unamortized Discount | 70.00M | as of 2025-12-31 |
| Debt Issuance Costs, Net | 179.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits | 9.00M | 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, Increase Resulting from Current Period Tax Positions | 2.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0 | 2025-01-01 → 2025-12-31 |
| Unbilled Contracts Receivable | 4.00M | as of 2025-12-31 |
| Income Taxes Receivable, Current | 11.00M | as of 2025-12-31 |
| Direct Financing Lease, Residual Value of Leased Asset | 3.00M | as of 2025-12-31 |
| Other Receivables | 232.00M | as of 2025-12-31 |
| Allowance for Doubtful Other Receivables, Current | 35.00M | as of 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | -5.00M | as of 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings | -3.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements | -3.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 | 0 | 2025-01-01 → 2025-12-31 |
| Credit Derivative, Maximum Exposure, Undiscounted | 73.00M | as of 2025-12-31 |
| Credit Risk Derivatives, at Fair Value, Net | 28.00M | as of 2025-12-31 |
| Collateral Already Posted, Aggregate Fair Value | 2.00M | as of 2025-12-31 |