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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 78 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 1 $ 1 $ 5 $ 5  
Interest cost 4 5 12 13  
Expected return on plan assets 0 0 0 0  
Amortization:          
Actuarial loss 0 0 0 0  
Prior service credit (4) (3) (11) (11)  
Settlement and curtailment loss 0 0 0 0  
Net periodic cost 1 3 6 7 $ (103)
United States Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 1 1 2 2  
Interest cost 34 37 101 111  
Expected return on plan assets (43) (47) (131) (140)  
Amortization:          
Actuarial loss 12 12 37 35  
Prior service credit (1) 0 (2) (2)  
Settlement and curtailment loss 0 0 0 0  
Net periodic cost 3 3 7 6  
Foreign Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 1 1 4 4  
Interest cost 6 7 17 21  
Expected return on plan assets (8) (7) (23) (23)  
Amortization:          
Actuarial loss 2 1 5 3  
Prior service credit 0 0 0 0  
Settlement and curtailment loss 0 1 1 1  
Net periodic cost $ 1 $ 3 $ 4 $ 6