| Finance Lease, Right-of-Use Asset, Accumulated Amortization | 199.00M | as of 2025-12-31 |
| Current Federal Tax Expense (Benefit) | -580.00M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | 54.00M | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | -526.00M | 2025-01-01 → 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | 539.00M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | 61.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Incurred | 252.00M | 2025-01-01 → 2025-12-31 |
| Asset Retirement Obligation, Liabilities Settled | 351.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Liability, Current | 39.00M | as of 2025-12-31 |
| Asset Retirement Obligation, Revision of Estimate | -69.00M | 2025-01-01 → 2025-12-31 |
| Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | 35.00M | 2025-01-01 → 2025-12-31 |
| Alternative Investment | 2.30B | as of 2025-12-31 |
| Share-based Payment Arrangement, Expense | 46.00M | 2025-01-01 → 2025-12-31 |
| Security Deposit | 3.50B | as of 2025-12-31 |
| Margin Deposit Assets | 181.00M | as of 2025-12-31 |
| Derivative Asset, Not Offset, Policy Election Deduction | 65.00M | as of 2025-12-31 |
| DerivativeAssetFairValueAfterOffsetAndDeductionSubjectToMasterNettingArrangement | 676.00M | as of 2025-12-31 |
| Derivative Asset, Not Subject to Master Netting Arrangement | 217.00M | as of 2025-12-31 |
| Dividends, Preferred Stock, Stock | 44.00M | 2025-01-01 → 2025-12-31 |
| Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure | 223.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | 152.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 758.00M | 2025-01-01 → 2025-12-31 |
| Energy Related Inventory, Gas Stored Underground | 24.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 109.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense, Tax Benefit | 10.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 87.00M | 2025-01-01 → 2025-12-31 |
| Letters of Credit Outstanding, Amount | 1.00M | as of 2025-12-31 |
| Contract with Customer, Liability, Revenue Recognized | 50.00M | 2025-01-01 → 2025-12-31 |
| Equity Securities, FV-NI, Unrealized Gain (Loss) | 909.00M | 2025-01-01 → 2025-12-31 |
| Equity Securities, FV-NI, Gain (Loss) | 913.00M | 2025-01-01 → 2025-12-31 |
| Line of Credit Facility, Maximum Borrowing Capacity | 8.00B | as of 2025-12-31 |
| Line of Credit Facility, Remaining Borrowing Capacity | 5.96B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Generation or Processing | 28.09B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Transmission | 19.61B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Distribution | 25.52B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Fuel | 2.44B | as of 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 19.20B | as of 2025-12-31 |
| Noncontrolling Interest, Period Increase (Decrease) | 1.57B | 2025-01-01 → 2025-12-31 |
| Line of Credit Facility, Periodic Payment, Interest | 42.00M | 2025-01-01 → 2025-12-31 |
| Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 1.98B | as of 2025-12-31 |
| SegmentReportingOtherItemAmount | -1.09B | 2025-01-01 → 2025-12-31 |
| Dividends, Common Stock, Cash | 2.28B | 2025-01-01 → 2025-12-31 |
| Net Income (Loss) Attributable to Parent, Diluted | 2.97B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount | 14.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 7.00M | 2025-01-01 → 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year One | 107.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Two | 97.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Three | 84.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Four | 72.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Five | 46.00M | as of 2025-12-31 |
| Guarantor Obligations, Maximum Exposure, Undiscounted | 3.53B | as of 2025-12-31 |
| Derivative Liability, Not Offset, Policy Election Deduction | 65.00M | as of 2025-12-31 |
| DerivativeLiabilityFairValueAfterOffsetAndDeductionSubjectToMasterNettingArrangement | 50.00M | as of 2025-12-31 |
| Derivative Liability, Not Subject to Master Netting Arrangement | 5.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 0 | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 25.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 10.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 413.00M | as of 2025-12-31 |
| Deferred Credits and Other Liabilities | 27.92B | as of 2025-12-31 |
| Regulatory Assets | 9.66B | as of 2025-12-31 |
| Regulatory Liabilities | 9.61B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Unrealized Loss Position | 48.00M | as of 2025-12-31 |
| Deferred Tax Assets, Operating Loss Carryforwards | 790.00M | as of 2025-12-31 |
| Stock Issued During Period, Value, New Issues | 1.49B | 2025-01-01 → 2025-12-31 |
| Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 5.80B | as of 2025-12-31 |
| Goodwill, Period Increase (Decrease) | 0 | 2025-01-01 → 2025-12-31 |
| Operating Lease, Cost | 92.00M | 2025-01-01 → 2025-12-31 |
| Short-term Lease, Cost | 22.00M | 2025-01-01 → 2025-12-31 |
| Variable Lease, Cost | 5.00M | 2025-01-01 → 2025-12-31 |
| Lease, Cost | 185.00M | 2025-01-01 → 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year One | 131.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Two | 135.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Three | 126.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Four | 109.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, Year Five | 76.00M | as of 2025-12-31 |
| Finance Lease, Liability, to be Paid, after Year Five | 201.00M | as of 2025-12-31 |
| Finance Lease, Liability, Payment, Due | 778.00M | as of 2025-12-31 |
| Finance Lease, Liability, Undiscounted Excess Amount | 223.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 48.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 70.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 38.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 45.00M | as of 2025-12-31 |
| Regulated and Unregulated Operating Revenue | 16.51B | 2025-01-01 → 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 35.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 1.12B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 1.35B | as of 2025-12-31 |
| Derivative, Collateral, Right to Reclaim Cash | 125.00M | as of 2025-12-31 |
| Utilities Operating Expense, Maintenance and Operations | 3.55B | 2025-01-01 → 2025-12-31 |
| Derivative, Collateral, Obligation to Return Cash | 0 | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 2.06B | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 616.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 9.95B | as of 2025-12-31 |
| Long-term Debt, Gross | 46.33B | as of 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 5.56B | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 7.88B | as of 2025-12-31 |
| Defined Benefit Plan, Accumulated Benefit Obligation | 7.60B | as of 2025-12-31 |
| Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | 26.00M | as of 2025-12-31 |
| Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets | 0 | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation, Purchases | 71.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 2.29B | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 90.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 1.96B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 2.48B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 698.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 2.51B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 36.40B | as of 2025-12-31 |
| Operating Loss Carryforwards | 2.61B | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year One | 85.00M | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year Two | 86.00M | as of 2025-12-31 |
| Operating Loss Carryforwards, Valuation Allowance | 132.00M | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year Three | 85.00M | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year Four | 84.00M | as of 2025-12-31 |
| Purchase Obligation, to be Paid, Year Five | 85.00M | as of 2025-12-31 |
| Purchase Obligation, to be Paid, after Year Five | 456.00M | as of 2025-12-31 |
| Purchase Obligation | 881.00M | as of 2025-12-31 |
| Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | -403.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits | 132.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 7.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 45.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 0 | 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 | 0 | 2025-01-01 → 2025-12-31 |
| Interest Rate Fair Value Hedge Derivative at Fair Value, Net | 0 | as of 2025-12-31 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 59.00M | as of 2025-12-31 |
| Allowance for Doubtful Other Receivables, Current | 3.00M | as of 2025-12-31 |
| Other Receivables, Net, Current | 446.00M | as of 2025-12-31 |
| Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings | 1.00M | 2025-01-01 → 2025-12-31 |
| Derivative, Net Liability Position, Aggregate Fair Value | 29.00M | as of 2025-12-31 |
| Collateral Already Posted, Aggregate Fair Value | 0 | as of 2025-12-31 |
| Additional Collateral, Aggregate Fair Value | 29.00M | as of 2025-12-31 |
| Derivative Liability, Fair Value, Gross Liability | 240.00M | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Asset | 741.00M | as of 2025-12-31 |