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Benefit Plans - Pension amounts recognized (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amounts recognized in accumulated other comprehensive loss, excluding tax effects, that have not yet been recognized as components of net periodic benefit cost      
Accumulated benefit obligation $ 601 $ 543  
US      
Amounts recognized in the Consolidated Balance Sheets      
Non-current asset 32 7  
Current liabilities (1) (1)  
Non-current liabilities (10) (10)  
Net asset (liability) recognized 21 (4)  
Amounts recognized in accumulated other comprehensive loss, excluding tax effects, that have not yet been recognized as components of net periodic benefit cost      
Net actuarial loss 15 40  
Prior service cost (6) (6)  
Net amount recognized 9 34  
Information about plan obligations and assets for plans with an accumulated benefit obligation in excess of plan assets      
Projected benefit obligation 11 11  
Accumulated benefit obligation 10 9  
Components of net periodic benefit cost      
Service cost 5 6 $ 6
Interest cost 14 13 13
Expected return on plan assets (18) (21) (21)
Amortization of actuarial loss 1    
Amortization of prior service credit (1)   (1)
Net periodic benefit cost/(benefit) 1 (2) (3)
Amount related to the amortization of the entity's accumulated actuarial loss included in accumulated other comprehensive loss that will be recognized in net pension expense in next fiscal year 1    
Amounts recorded in other comprehensive income and net periodic benefit cost      
Net actuarial (gain) loss (25) 19 (7)
Amortization of actuarial loss (1)    
Amortization of prior service credit 1   1
Total recorded in other comprehensive income (25) 19 (6)
Net periodic benefit cost 1 (2) (3)
Total recorded in other comprehensive income and net periodic benefit cost (24) 17 (9)
Non-US      
Amounts recognized in the Consolidated Balance Sheets      
Non-current asset 31 32  
Current liabilities (2) (1)  
Non-current liabilities (52) (47)  
Net asset (liability) recognized (23) (16)  
Amounts recognized in accumulated other comprehensive loss, excluding tax effects, that have not yet been recognized as components of net periodic benefit cost      
Net actuarial loss 62 57  
Transition obligation 1 1  
Prior service cost   (1)  
Net amount recognized 63 57  
Information about plan obligations and assets for plans with an accumulated benefit obligation in excess of plan assets      
Projected benefit obligation 56 49  
Accumulated benefit obligation 45 41  
Fair value of plan assets 2 2  
Components of net periodic benefit cost      
Service cost 3 3 3
Interest cost 10 10 11
Expected return on plan assets (8) (9) (10)
Amortization of actuarial loss 2 2 2
Net periodic benefit cost/(benefit) 7 6 6
Amount related to the amortization of the entity's accumulated actuarial loss included in accumulated other comprehensive loss that will be recognized in net pension expense in next fiscal year (2)    
Amounts recorded in other comprehensive income and net periodic benefit cost      
Net actuarial (gain) loss 7 4 (3)
Prior service cost 1    
Amortization of actuarial loss (2) (2) (2)
Total recorded in other comprehensive income 6 2 (5)
Net periodic benefit cost 7 6 6
Total recorded in other comprehensive income and net periodic benefit cost $ 13 $ 8 $ 1