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Pension and Other Postretirement Benefit Plans - Net Periodic Costs Recognized in Operating Profit and Interest and Sundry (Income) Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 87 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost $ (3) $ 9 $ (89)
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 (5) 7  
United States Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost (1) 0  
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 (2) (1)  
Foreign Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 3 2  
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 $ 2 $ 1