| Current Federal Tax Expense (Benefit) | 119.00M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | 13.00M | 2025-01-01 → 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | 169.00M | 2025-01-01 → 2025-12-31 |
| Increase (Decrease) Cash Collateral from Counterparties | -10.00M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 223.00M | 2025-01-01 → 2025-12-31 |
| Other Tax Expense (Benefit) | -1.00M | 2025-01-01 → 2025-12-31 |
| Accrual for Environmental Loss Contingencies, Gross | 386.00M | as of 2025-12-31 |
| Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes | 98.00M | as of 2025-12-31 |
| Debt Instrument, Fair Value Disclosure | 502.00M | as of 2025-12-31 |
| Energy Related Inventory, Natural Gas in Storage | 88.00M | as of 2025-12-31 |
| Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | 183.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 691.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 187.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 2.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Amount | 13.00M | 2025-01-01 → 2025-12-31 |
| Contract with Customer, Liability, Revenue Recognized | -8.00M | 2025-01-01 → 2025-12-31 |
| Inventory, Raw Materials and Supplies, Net of Reserves | 780.00M | as of 2025-12-31 |
| Other Labor-related Expenses | 135.00M | 2025-01-01 → 2025-12-31 |
| Deferred Costs and Other Assets | 22.71B | as of 2025-12-31 |
| Dividends, Common Stock, Cash | 1.62B | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Net | 84.32B | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 13.00M | 2025-01-01 → 2025-12-31 |
| Revenue, Remaining Performance Obligation, Amount | 119.00M | as of 2025-12-31 |
| Guarantor Obligations, Maximum Exposure, Undiscounted | 54.00M | as of 2025-12-31 |
| Derivative, Fair Value, Net | -12.00M | as of 2025-12-31 |
| Derivative, Notional Amount | 5.28B | as of 2025-12-31 |
| Deferred Income Taxes and Other Tax Liabilities, Noncurrent | 13.71B | as of 2025-12-31 |
| Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | -52.00M | 2025-01-01 → 2025-12-31 |
| Deferred Credits and Other Liabilities | 29.64B | as of 2025-12-31 |
| Contract with Customer, Refund Liability, Current | 533.00M | as of 2025-12-31 |
| Regulatory Assets | 10.57B | as of 2025-12-31 |
| Regulatory Liabilities | 12.14B | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 691.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 275.00M | as of 2025-12-31 |
| Goodwill, Acquired During Period | 0 | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards, General Business | 0 | as of 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 553.00M | as of 2025-12-31 |
| Goodwill, Gross | 8.61B | as of 2025-12-31 |
| Operating Lease, Cost | 47.00M | 2025-01-01 → 2025-12-31 |
| Goodwill, Impaired, Accumulated Impairment Loss | 1.98B | as of 2025-12-31 |
| Variable Lease, Cost | 7.00M | 2025-01-01 → 2025-12-31 |
| Lease, Cost | 54.00M | 2025-01-01 → 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 3.00M | 2025-01-01 → 2025-12-31 |
| Goodwill, Impairment Loss, Net of Tax | 0 | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Derivative Instruments | 26.00M | as of 2025-12-31 |
| Accounts Receivable, Purchase | 4.34B | 2025-01-01 → 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 26.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 24.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 24.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 24.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 24.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 91.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 213.00M | as of 2025-12-31 |
| Deferred Tax Assets, Other | 601.00M | as of 2025-12-31 |
| Utilities Operating Expense, Taxes | 1.00B | 2025-01-01 → 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 48.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 13.69B | as of 2025-12-31 |
| Long-term Debt, Gross | 49.04B | as of 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 13.99B | as of 2025-12-31 |
| Deferred Tax Liabilities, Investments | 28.00M | as of 2025-12-31 |
| Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 19.00M | as of 2025-12-31 |
| Operating Lease, Lease Income, Lease Payments | 5.00M | 2025-01-01 → 2025-12-31 |
| Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease | 28.00M | 2025-01-01 → 2025-12-31 |
| Other Commitment, to be Paid, Year One | 253.00M | as of 2025-12-31 |
| Other Commitment, to be Paid, Year Two | 8.00M | as of 2025-12-31 |
| Other Commitment, to be Paid, Year Three | 162.00M | as of 2025-12-31 |
| Other Commitment, to be Paid, Year Four | 4.00M | as of 2025-12-31 |
| Other Commitment, to be Paid, Year Five | 4.00M | as of 2025-12-31 |
| Other Commitment, to be Paid, after Year Five | 306.00M | as of 2025-12-31 |
| Other Commitment | 737.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 1.67B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 1.03B | as of 2025-12-31 |
| Defined Contribution Plan, Employer Discretionary Contribution Amount | 121.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 2.00B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 1.93B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 1.86B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 40.95B | as of 2025-12-31 |
| Debt Instrument, Unamortized Discount (Premium), Net | 93.00M | as of 2025-12-31 |
| Operating Lease, Variable Lease Income | 1.00M | 2025-01-01 → 2025-12-31 |
| Tax Credit Carryforward, Valuation Allowance | 0 | as of 2025-12-31 |
| Unrecognized Tax Benefits | 100.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 1.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 0 | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 3.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Period Increase (Decrease) | 0 | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 83.00M | as of 2025-12-31 |
| Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 65.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year One | 7.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year Two | 7.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year Three | 6.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year Four | 6.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, Year Five | 5.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payment to be Received, after Year Five | 17.00M | as of 2025-12-31 |
| Lessor, Operating Lease, Payments to be Received | 48.00M | as of 2025-12-31 |
| Unbilled Contracts Receivable | 1.23B | as of 2025-12-31 |
| Pension and Other Postretirement Benefits Cost (Reversal of Cost) | 273.00M | 2025-01-01 → 2025-12-31 |
| Income Taxes Receivable, Noncurrent | 100.00M | as of 2025-12-31 |
| Nontrade Receivables, Noncurrent | 4.75B | as of 2025-12-31 |
| Other Receivables, Gross, Current | 1.88B | as of 2025-12-31 |
| Allowance for Doubtful Other Receivables, Current | 94.00M | as of 2025-12-31 |
| Other Receivables, Net, Current | 1.78B | as of 2025-12-31 |
| Allowance for Funds Used During Construction, Capitalized Interest | 275.00M | 2025-01-01 → 2025-12-31 |