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Pension and Other Postretirement Benefit Plans - Summary of Components of Net Periodic Pension Costs (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]      
Service cost $ 2 $ 2  
Interest cost 4 4  
Expected return on plan assets 0 0  
Amortization:      
Actuarial loss 0 0  
Prior service cost (credit) (2) 3  
Settlement and curtailment (gain) loss (7) 0  
Net periodic benefit cost (credit) (3) 9 $ (89)
United States Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 1  
Interest cost 31 30  
Expected return on plan assets (44) (43)  
Amortization:      
Actuarial loss 12 13  
Prior service cost (credit) (1) (1)  
Settlement and curtailment (gain) loss 0 0  
Net periodic benefit cost (credit) (1) 0  
Foreign Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 1  
Interest cost 6 6  
Expected return on plan assets (7) (8)  
Amortization:      
Actuarial loss 2 3  
Prior service cost (credit) 0 0  
Settlement and curtailment (gain) loss 1 0  
Net periodic benefit cost (credit) $ 3 $ 2