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Commodity Derivatives (Details) MWh in Millions, MMBTU in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) MWh MMBTU | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) MWh MMBTU | Sep. 30, 2022 USD ($) | Dec. 31, 2022 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 |  | $ (28) | $ 0 | $ (135) | $ 103 |
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] | 68 |  | 68 |  | 61
Natural Gas Commodity |  |  |  |  |  |
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | MMBTU | [1],[2] | 105 |  | 105 |  | 131
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 |  | $ (5) | $ (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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