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, 2021	Dec. 31, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Actuarial (Gain) Loss in Current Period	$ (608)	$ 296
Amortization of Net Actuarial Gain (Loss)	(103)	(92)
Prior Service Cost (Credit) in Current Period	0	0
Amortization of Prior Service Credit	0	10
Total	(711)	214
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Actuarial (Gain) Loss in Current Period	(127)	2
Amortization of Net Actuarial Gain (Loss)	(44)	(47)
Prior Service Cost (Credit) in Current Period	0	(5)
Amortization of Prior Service Credit	129	128
Total	$ (42)	$ 78