Pension And Postretirement Benefits (Qualified Pension and Postretirement Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Net (credit) cost	$ (2,089)	$ (1,346)	$ (6,186)	$ (5,897)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	141	241	488	723
Interest cost on projected / accumulated postretirement benefit obligation	481	321	1,216	951
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	740	890	2,410	2,617
Amortization of prior service credit	(33)	(36)	(100)	(108)
Net periodic benefit (credit) costs	(151)	(364)	(806)	(1,051)
Actuarial (gain) loss	216	374	2,573	3,021
Net (credit) cost	(367)	(738)	(3,379)	(4,072)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	7	11	25	34
Interest cost on projected / accumulated postretirement benefit obligation	75	53	201	158
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	23	38	88	114
Amortization of prior service credit	(697)	(634)	(1,861)	(1,903)
Net periodic benefit (credit) costs	(638)	(608)	(1,723)	(1,825)
Actuarial (gain) loss	1,084	0	1,084	0
Net (credit) cost	$ (1,722)	$ (608)	$ (2,807)	$ (1,825)