Pension And Postretirement Benefits (Qualified Pension and Postretirement Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Net (credit) cost	$ (696)	$ (2,089)	$ (2,111)	$ (6,186)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	122	141	365	488
Interest Cost on projected/accumulated benefit obligations	416	481	1,448	1,216
Expected return on assets	570	740	1,999	2,410
Amortization of prior service credit	(33)	(33)	(100)	(100)
Net periodic benefit (credit) costs	(65)	(151)	(286)	(806)
Actuarial (gain) loss	(71)	(216)	218	(2,573)
Settlement (gain) loss	0	0	363	0
Net (credit) cost	(136)	(367)	(431)	(3,379)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	5	7	17	25
Interest Cost on projected/accumulated benefit obligations	85	75	255	201
Expected return on assets	32	23	98	88
Amortization of prior service credit	(618)	(697)	(1,854)	(1,861)
Net periodic benefit (credit) costs	(560)	(638)	(1,680)	(1,723)
Actuarial (gain) loss	0	(1,084)	0	(1,084)
Net (credit) cost	$ (560)	$ (1,722)	$ (1,680)	$ (2,807)