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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
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 cost (credit) 3 (4)  
Net periodic cost 9 2 $ (87)
United States Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 1  
Interest cost 30 34  
Expected return on plan assets (43) (44)  
Amortization:      
Actuarial loss 13 12  
Prior service cost (credit) (1) (1)  
Net periodic cost 0 2  
Foreign Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 1  
Interest cost 6 5  
Expected return on plan assets (8) (7)  
Amortization:      
Actuarial loss 3 2  
Prior service cost (credit) 0 0  
Net periodic cost $ 2 $ 1