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v3.23.1

Commodity Derivatives (Details) MWh in Millions, MMBTU in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) MWh MMBTU | Mar. 31, 2022 USD ($) | Dec. 31, 2022 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 |  | $ (89) | $ 5 |
Electric Commodity [Member] |  |  |  |
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract] |  |  |  |
Derivative, Nonmonetary Notional Amount | MWh | [1],[2] | 41 |  | 61
Cash Flow Hedges |  |  |  |
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract] |  |  |  |
Derivative Instruments in Hedges, at Fair Value, Net |  | $ 0 |  |
Natural Gas Commodity |  |  |  |
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract] |  |  |  |
Derivative, Nonmonetary Notional Amount | MMBTU | [1],[2] | 117 |  | 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 |  | $ 3 | $ 4 |
[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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