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Pension - Summary of Balance Sheet Impact, Including Benefit Obligations, Assets and Funded Status (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Actuarial losses (gains) $ 44    
Actual return (loss) on plan assets 35    
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year [1] 344 $ 286 $ 279
Service cost 7 5 1 [2]
Interest cost 11 13 2 [2]
Actuarial losses (gains) 38 51 5
Net benefits paid (4) (13) (1)
Settlements (22)    
Other   2  
Benefit obligation at end of year 374 344 [1] 286 [1]
Fair value of plan assets at beginning of year [1] 331 274 279
Actual return (loss) on plan assets 35 70 (4)
Contributions 1    
Net benefits paid (4) (13) (1)
Settlements (22)    
Other (1)    
Fair value of plan assets at end of year 340 331 [1] 274 [1]
Funded status of plans (non-current) (34) (13) (12)
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year [1] 137 93 95
Service cost 7 5 1 [2]
Interest cost 1 2  
Actuarial losses (gains) 6 27 (3)
Settlements (6) (3)  
Other 2 13  
Exchange rate adjustments 14    
Benefit obligation at end of year 161 137 [1] 93 [1]
Fair value of plan assets at beginning of year [1] 27 20 20
Actual return (loss) on plan assets   2  
Contributions 2 2  
Net benefits paid   1  
Settlements (6) (3)  
Other 3 5  
Exchange rate adjustments 2    
Fair value of plan assets at end of year 28 27 [1] 20 [1]
Funded status of plans (non-current) $ (133) $ (110) $ (73)
[1] 2018 "Beginning of year" is the Spin-Off date, October 29, 2018.
[2] 2018 begins at the Spin-Off date, October 29, 2018. Activity before the Spin-Off date was recognized under the Shared Plans.