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Retirement Benefits and Trusteed Assets (Pension Plan - Other Changes in Plan Assets and Benefit Obligations recognized in Reg Assets and OCI) (Details) - Pension plan - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income (loss) |  |
Net actuarial (gain) loss | $ 156 | $ (376)
Amortization of net actuarial loss and settlements | (209) | (209)
Prior service cost | 0 | 4
Amortization of prior service (cost) credit | 1 | (3)
Total recognized in Regulatory assets and Other comprehensive income (loss) | (52) | (584)
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss) | $ 71 | $ (445)

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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 Regulatory Assets and Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) 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 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, Adjustment, before Tax [Abstract] + References No definition available. + Details
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- Details
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