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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 72 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
United States Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1 $ 1  
Interest cost 34 37  
Expected return on plan assets (44) (47)  
Amortization:      
Actuarial loss 12 12  
Prior service credit (1) (1)  
Settlement and curtailment loss 0  
Net periodic cost 2 2  
Foreign Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 1  
Interest cost 5 7  
Expected return on plan assets (7) (8)  
Amortization:      
Actuarial loss 2 1  
Prior service credit 0 0  
Settlement and curtailment loss 0 1  
Net periodic cost 1 2  
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 2 2  
Interest cost 4 4  
Expected return on plan assets 0 0  
Amortization:      
Actuarial loss 0 0  
Prior service credit (4) (4)  
Settlement and curtailment loss 0 0  
Net periodic cost $ 2 $ 2 $ 104