Employee Benefit Plans (Retirement Plan Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Settlement charges	$ 83	$ 0	$ 0
Defined contribution plans	61	54	58
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	64	61	58
Interest cost	48	70	82
Expected return on plan assets	(95)	(126)	(115)
Settlement charges	83	0	96
Amortization of actuarial loss	33	38	26
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(20)	(19)	(19)
Net periodic defined benefit plan expense	113	24	128
Pension Expense	174	78	186
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	1	1	2
Interest cost	2	4	5
Settlement charges	0	0	3
Amortization of actuarial loss	6	6	4
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(2)	(13)	(15)
Net periodic defined benefit plan expense	7	(2)	(1)
Pension Expense	$ 7	$ (2)	$ (1)