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Commodity Derivatives (Details) MWh in Millions, MMBTU in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) MMBTU MWh | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) MMBTU MWh | Jun. 30, 2024 USD ($) | Dec. 31, 2024 MWh MMBTU
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 |  | $ 9 | $ 41 | $ 21 |  | $ 44 |
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] | 65 |  | 65 |  |  | 38
Natural Gas Commodity |  |  |  |  |  |  |
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | MMBTU | [1],[2] | 60 |  | 60 |  |  | 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 |  |  | $ (1) | $ 7 | [3] | $ 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.
[3] | Other than $2 million of 2025 losses recorded to electric fuel and purchased power, amounts are recorded to cost of natural gas sold and transported. Amounts are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

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