Pension And Postretirement Benefits (Qualified Pension and Postretirement Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net (credit) cost	$ (670)	$ (1,952)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	121	183
Interest cost on projected / accumulated postretirement benefit obligation	516	320
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	714	868
Amortization of prior service credit	(33)	(33)
Net periodic benefit (credit) costs	(110)	(398)
Actuarial (gain) loss	0	1,012
Net (credit) cost	(110)	(1,410)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	6	9
Interest cost on projected / accumulated postretirement benefit obligation	85	63
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	33	32
Amortization of prior service credit	(618)	(582)
Net (credit) cost	$ (560)	$ (542)