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Pension and Other Postretirement Benefit Plans - Net Periodic Costs (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]      
Net periodic cost $ 9 $ 2 $ (87)
Operating profit | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 2 2  
Interest and sundry (income) expense | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 7 0  
United States Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 0 2  
United States Pension Benefits | Operating profit      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 1 1  
United States Pension Benefits | Interest and sundry (income) expense      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost (1) 1  
Foreign Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 2 1  
Foreign Pension Benefits | Operating profit      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 1 1  
Foreign Pension Benefits | Interest and sundry (income) expense      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost $ 1 $ 0