Pension and Other Postretirement Benefits - Pension Obligation and Funded Status (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
UNITED STATES
Benefit obligation
Balance at the beginning of the period	$ 409	$ 387
Service cost	4	5	$ 5
Interest cost	8	11	14
Benefits paid	(24)	(23)
Actuarial (gain) loss	(14)	29
Balance at the end of the period	383	409	387
Fair value of plan assets
Balance at the beginning of the period	439	408
Actual return on plan assets	4	53
Employer contributions	1	1
Benefits paid	(24)	(23)
Balance at the end of the period	420	439	408
Funded status	37	30
Non-US
Benefit obligation
Balance at the beginning of the period	275	254
Service cost	4	4	3
Interest cost	9	10	10
Benefits paid	(13)	(12)
Actuarial (gain) loss	(15)	14
Curtailment / settlement / amendments	(1)
Foreign currency translation	(5)	5
Balance at the end of the period	254	275	254
Fair value of plan assets
Balance at the beginning of the period	249	231
Actual return on plan assets	3	22
Employer contributions	7	4
Benefits paid	(13)	(12)
Plan settlements	(1)
Foreign currency translation	(1)	4
Balance at the end of the period	244	249	$ 231
Funded status	$ (10)	$ (26)

The amount of increase or decrease due to a) an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services, b) an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement, c) change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

No definition available.