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Fair Value - Schedule of Activity For Energy Commodity and Equity Investments Derivative Assets (Liabilities) Measured At Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Level 3 [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance |  | $ 42 | $ 36 | $ (8)
Transfers in | [1] |  |  | 21
Included in regulatory assets |  | 5 | 10 | (5)
Recognized in net income |  |  | $ (4) | $ 33
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Purchases and debt conversions |  | 3 | $ 3 |
Settlements |  |  |  | $ (5)
Other |  |  | (3) |
Ending Balance |  | 50 | 42 | 36
Equity Investment [Member] |  |  |  |
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance |  | 50 | 54 |
Transfer in | [1] |  |  | 21
Recognized in net income |  |  | $ (4) | $ 33
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Purchases and debt conversions |  | 3 | $ 3 |
Other |  |  | (3) |
Ending Balance |  | 53 | 50 | $ 54
Natural Gas Exchange Agreements [Member] |  |  |  |
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | [2] | (8) | (18) | (8)
Included in regulatory assets | [2] | 5 | 10 | (5)
Settlements | [2] |  |  | (5)
Ending Balance | [2] | $ (3) | $ (8) | $ (18)
[1] | The Company elected to account for certain equity investments at recurring fair value in 2022; as such, the transfer in represents the value as of the date of the election. See further discussion within Note 7.
[2] | There were no purchases, issuances or transfers from other categories of derivatives instruments during the periods presented in the table above.

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