Employee Benefit Plans (Components of Net Periodic PRB (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)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost		7	6	2
Interest cost		24	37	31
Expected return on plan assets		(21)	(13)	(1)
Amortization of prior service cost (credit)		(3)	(3)	(42)
Recognized actuarial net loss		(6)	(12)	(12)
Net settlement, curtailment and special termination benefits (gain) loss		0	1	0
Non-service pension income		(6)	10	(24)
Net periodic pension and other postretirement income		$ 1	$ 16	$ (22)