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Qualifying Cash Flow Hedges (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Impact of Derivative Activity |  |  |  |  |  |
Fair Value Hedges, Net |  | $ 0 | $ 0 |  | $ 0 |
Not Designated as Hedging Instrument |  |  |  |  |  |
Impact of Derivative Activity |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  | 0 | 0 |  | 0 |
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net |  | 48,000,000 | (150,000,000) |  | (26,000,000) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0 | 0 |  | 0 |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) |  | (22,000,000) | (138,000,000) |  | (13,000,000) |
Derivative, Gain (Loss) on Derivative, Net |  | (49,000,000) | (34,000,000) |  | (2,000,000) |
Not Designated as Hedging Instrument | Commodity Trading Contract |  |  |  |  |  |
Impact of Derivative Activity |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0 | 0 |  | 0 |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) |  | 0 | 0 |  | 0 |
Derivative, Gain (Loss) on Derivative, Net | [1] | (27,000,000) | (7,000,000) |  | 25,000,000 |
Not Designated as Hedging Instrument | Electric Commodity Contract |  |  |  |  |  |
Impact of Derivative Activity |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  | 0 | 0 |  | 0 |
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net |  | 44,000,000 | (137,000,000) |  | (10,000,000) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0 | 0 |  | 0 |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) | [2] | 22,000,000 | (123,000,000) |  | (3,000,000) |
Derivative, Gain (Loss) on Derivative, Net |  | 0 | 0 |  | 0 |
Not Designated as Hedging Instrument | Natural Gas Commodity Contract |  |  |  |  |  |
Impact of Derivative Activity |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  | 0 | 0 |  | 0 |
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net |  | 4,000,000 | (13,000,000) |  | (16,000,000) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0 | 0 |  | 0 |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) |  | 0 | 15,000,000 | [3] | (10,000,000) | [3]
Derivative, Gain (Loss) on Derivative, Net | [3],[4] | (22,000,000) | (27,000,000) |  | (27,000,000) |
Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |  |
Impact of Derivative Activity |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  | 29,000,000 | (2,000,000) |  | 22,000,000 |
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net |  | 0 | 0 |  | 0 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (3,000,000) | (5,000,000) |  | (7,000,000) |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) |  | 0 | 0 |  | 0 |
Derivative, Gain (Loss) on Derivative, Net |  | 0 | 0 |  | 0 |
Cash Flow Hedges | Designated as Hedging Instrument | Interest Rate Contract |  |  |  |  |  |
Impact of Derivative Activity |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  | 29,000,000 | (2,000,000) |  | 22,000,000 |
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net |  | 0 | 0 |  | 0 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [5] | (3,000,000) | (5,000,000) |  | (7,000,000) |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) |  | 0 | 0 |  | 0 |
Derivative, Gain (Loss) on Derivative, Net |  | $ 0 | $ 0 |  | $ 0 |
[1] | Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
[2] | Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms and reclassified out of income as regulatory assets or liabilities, as appropriate. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.
[3] | Other than $3 million of 2024 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.
[4] | Relates primarily to option premium amortization.
[5] | Recorded to interest charges.

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