Benefit Plans (Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
UNITED STATES
Change in projected benefit obligation:
Benefit obligation, beginning period	$ 1,331	$ 1,242
Service cost	14	12	$ 11
Interest cost	24	35	44
Plan amendments	8	1
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment	0	0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(101)	(81)
Actuarial (gain) loss	(51)	122
Effect of foreign currency exchange rate changes	0	0
Benefit obligation, ending period	1,225	1,331	1,242
Change in plan assets:
Fair value of plan assets, beginning period	1,249	1,154
Actual return on plan assets	60	168
Employer contributions	10	8
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(101)	(81)
Effect of foreign currency exchange rate changes	0	0
Fair value of plan assets, ending period	1,218	1,249	1,154
Funded status as of December 31	(7)	(82)
Foreign Plan [Member]
Change in projected benefit obligation:
Benefit obligation, beginning period	218	224
Service cost	6	6	8
Interest cost	15	14	19
Defined Benefit Plan, Benefit Obligation, Interest cost	15	14
Plan amendments	0	0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment	(23)	(6)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	(1)	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(10)	(9)
Actuarial (gain) loss	(16)	19
Effect of foreign currency exchange rate changes	(16)	(30)
Benefit obligation, ending period	173	218	224
Change in plan assets:
Fair value of plan assets, beginning period	112	129
Actual return on plan assets	9	13
Employer contributions	4	5
Defined Benefit Plan, Plan Assets, Payment for Settlement	(1)	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(10)	(9)
Effect of foreign currency exchange rate changes	(8)	(26)
Fair value of plan assets, ending period	106	112	$ 129
Funded status as of December 31	$ (67)	$ (106)