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Pension, OPEB and Savings Plans (Pre-Tax Changes Recognized In Accumulated Other Comprehensive Income (Loss), Regulatory Assets And Deferred Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period due to Plan Experience and Assumption Changes | $ (35) | $ 568
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax | (39) | 0
Amortization of Net Actuarial Gain (Loss) | (83) | (60)
Recognition of Net Actuarial (Gain) Loss due to Settlements/Curtailments | (338) | 0
Prior Service Cost (Credit) in Current Period | 0 | 0
Amortization of Prior Service Credit | 0 | 0
Total | (495) | 508
Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period due to Plan Experience and Assumption Changes | (49) | (138)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax | 0 | 0
Amortization of Net Actuarial Gain (Loss) | 2 | (14)
Recognition of Net Actuarial (Gain) Loss due to Settlements/Curtailments | 0 | 0
Prior Service Cost (Credit) in Current Period | 6 | 0
Amortization of Prior Service Credit | 52 | 129
Total | $ 11 | $ (23)

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