Employee Benefit Plans (Components of Net Periodic PRB (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)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	6
Interest cost	29	24	37
Expected return on plan assets	(22)	(21)	(13)
Amortization of prior service cost (credit)	(2)	(3)	(3)
Recognized actuarial net (gain) loss	(11)	(6)	(12)
Net settlement, curtailment and special termination benefits loss	(3)	0	1
Non-service pension income	(9)	(6)	10
Net periodic pension and other postretirement income	$ (3)	$ 1	$ 16