Employee Benefit Plans (Components of Net Periodic Pension (Income) Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Non-service pension income	$ (1,889)	$ (1,944)	$ (902)
Net periodic pension and other postretirement income	(1,413)	(1,414)	(413)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	470	523	483
Interest cost	1,520	1,249	1,650
Expected return on plan assets	(3,544)	(3,476)	(2,995)
Amortization of prior service cost (credit)	(163)	(168)	51
Recognized actuarial net (gain) loss	305	435	337
Net settlement, curtailment and special termination benefits loss	2	22	45
Non-service pension income	(1,880)	(1,938)	(912)
Net periodic pension and other postretirement income	$ (1,410)	$ (1,415)	$ (429)