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Retirement Benefits and Trusteed Assets (Pension Plan - Other Changes in Plan Assets and Benefit Obligations recognized in Regulatory Assets and OCI) (Details) - Pension plan - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income (loss) |  |
Net actuarial (gain) loss | $ (49) | $ 62
Amortization of net actuarial loss and settlements | (59) | (14)
Amortization of prior service credit | 2 | 2
Total recognized in Regulatory assets and liabilities and Other comprehensive income (loss) | (106) | 50
Total recognized in net periodic pension credit, Regulatory assets, and Other comprehensive income (loss) | $ (124) | $ (19)

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- Definition Changes in Plan Assets and Benefit Obligations Recognized in Pension Cost, Comprehensive Income and Regulatory Assets + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss and regulatory assets related to pension and other postretirement defined benefit plans. + References No definition available. + Details
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- Definition Regulatory Assets And Other Comprehensive Income (Loss), Pension And Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Before Tax + References No definition available. + Details
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- Definition Regulatory Assets And Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI, Pension And Other Postretirement Benefit Plans, For Net Gain (Loss) And Settlements, Before Tax + References No definition available. + Details
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- Definition Regulatory Assets and Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax + References No definition available. + Details
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- Definition Regulatory Assets and Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax [Abstract] + References No definition available. + Details
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- Details
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