Employee Benefit Plans (Components of Net Periodic Pension (Income) Expense) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Net settlement, curtailment and special termination benefits (gain) loss	$ (98)
Non-service pension income		$ (1,944)	$ (902)	$ (829)
Net periodic pension and other postretirement income		(1,414)	(413)	(566)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost		523	483	261
Interest cost		1,249	1,650	1,245
Expected return on plan assets		(3,476)	(2,995)	(2,252)
Amortization of prior service cost (credit)		(168)	51	16
Recognized actuarial net loss		435	337	245
Net settlement, curtailment and special termination benefits (gain) loss		22	45	(59)
Non-service pension income		(1,938)	(912)	(805)
Net periodic pension and other postretirement income		$ (1,415)	$ (429)	$ (544)