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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, 2023 | Dec. 31, 2022
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income (loss) |  |
Net actuarial loss | $ 62 | $ 156
Amortization of net actuarial loss and settlements | (14) | (209)
Amortization of prior service credit | 2 | 1
Total recognized in Regulatory assets and Other comprehensive income (loss) | 50 | (52)
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss) | $ (19) | $ 71

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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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