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Commodity Derivatives (Details) MWh in Millions, MMBTU in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) MMBTU MWh | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) MMBTU MWh | Sep. 30, 2024 USD ($) | Dec. 31, 2024 MMBTU MWh
Other Derivative Instruments |  |  |  |  |  |
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract] |  |  |  |  |  |
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities |  | $ 5 | $ (6) | $ 26 | $ 38 |
Cash Flow Hedge Commodity [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Commodity contracts designated as cash flow hedges |  | $ 0 |  | $ 0 |  |
Electric Commodity [Member] |  |  |  |  |  |
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | MWh | [1],[2] | 50 |  | 50 |  | 38
Natural Gas Commodity |  |  |  |  |  |
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | MMBTU | [1],[2] | 56 |  | 56 |  | 77
Natural Gas Commodity | Other Derivative Instruments |  |  |  |  |  |
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract] |  |  |  |  |  |
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities |  | $ (8) | $ (6) | $ (1) | $ (3) |
[1] | Not reflective of net positions in the underlying commodities.
[2] | Notional amounts for options included on a gross basis but weighted for the probability of exercise.

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