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)