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Pension Benefits Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations [Abstract]      
Fair Value of Plan Assets $ 362 $ 377  
Liability, Other Retirement Benefits 3 4  
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (2) 0  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax (8) (9)  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Defined Benefit Plan, PBO 18 29  
Defined Benefit Plan, ABO 18 29  
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations [Abstract]      
Defined Benefit Plan, PBO 0 0  
Defined Benefit Plan, ABO 0 0  
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Defined Benefit Plan, Benefit Obligation 18 29 $ 40
Defined Benefit Plan, Accumulated Benefit Obligation 18 29  
Fair Value of Plan Assets 0 0 0
Defined Benefit Plan, Benefit Obligation, Benefits Paid 10 12  
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Assets for Plan Benefits, Defined Benefit Plan 2 4  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 4 1  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax (143) (144)  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Defined Benefit Plan, PBO 699 743  
Defined Benefit Plan, ABO 655 701  
Defined Benefit Plan, Fair Value of Plan Assets 258 282  
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations [Abstract]      
Defined Benefit Plan, PBO 110 92  
Defined Benefit Plan, ABO 85 64  
Defined Benefit Plan, Fair Value of Plan Assets 104 95  
Defined Benefit Plan, Benefit Obligation 809 835 2,137
Defined Benefit Plan, Accumulated Benefit Obligation 740 765  
Fair Value of Plan Assets 362 377 $ 1,212
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax 6 1  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) (6) 75  
Defined Benefit Plan, Benefit Obligation, Benefits Paid $ 30 $ 71