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Benefit Plans - Pension amounts recognized (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 $ 543 $ 603  
US      
Amounts recognized in the Consolidated Balance Sheets      
Non-current asset 7 23  
Current liabilities (1) (2)  
Non-current liabilities (10) (10)  
Net asset (liability) recognized (4) 11  
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 40 21  
Prior service cost (6) (6)  
Net amount recognized 34 15  
Information about plan obligations and assets for plans with an accumulated benefit obligation in excess of plan assets      
Projected benefit obligation 11 12  
Accumulated benefit obligation 9 11  
Components of net periodic benefit cost      
Service cost 6 6 $ 6
Interest cost 13 13 14
Expected return on plan assets (21) (21) (20)
Amortization of actuarial loss     1
Amortization of prior service credit   (1)  
Net periodic benefit cost (2) (3) 1
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 loss (gain) 19 (7) 10
Prior service cost     (6)
Amortization of actuarial loss     (1)
Amortization of prior service credit   1  
Total recorded in other comprehensive income 19 (6) 3
Net periodic benefit cost (2) (3) 1
Total recorded in other comprehensive income and net periodic benefit cost 17 (9) 4
Non-US      
Amounts recognized in the Consolidated Balance Sheets      
Non-current asset 32 37  
Current liabilities (1) (1)  
Non-current liabilities (47) (49)  
Net asset (liability) recognized (16) (13)  
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 57 55  
Transition obligation 1 1  
Prior service cost (1) (1)  
Net amount recognized 57 55  
Information about plan obligations and assets for plans with an accumulated benefit obligation in excess of plan assets      
Projected benefit obligation 49 51  
Accumulated benefit obligation 41 41  
Fair value of plan assets 2 2  
Components of net periodic benefit cost      
Service cost 3 3 3
Interest cost 10 11 10
Expected return on plan assets (9) (10) (10)
Amortization of actuarial loss 2 2 2
Settlement loss     1
Net periodic benefit cost 6 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 loss (gain) 4 (3) 6
Prior service cost     (1)
Amortization of actuarial loss (2) (2) (2)
Total recorded in other comprehensive income 2 (5) 3
Net periodic benefit cost 6 6 6
Total recorded in other comprehensive income and net periodic benefit cost $ 8 $ 1 $ 9