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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 9 Months Ended 87 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 2 $ 1 $ 5 $ 5  
Interest cost 3 4 10 12  
Expected return on plan assets 0 0 0 0  
Amortization:          
Actuarial loss 0 0 0 0  
Prior service credit (3) (4) (2) (11)  
Settlement and curtailment (gain) loss 4 0 4 0  
Net periodic cost 6 1 17 6 $ (83)
United States Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 1 1 2 2  
Interest cost 30 34 89 101  
Expected return on plan assets (43) (43) (128) (131)  
Amortization:          
Actuarial loss 14 12 40 37  
Prior service credit (1) (1) (2) (2)  
Settlement and curtailment (gain) loss 0 0 0 0  
Net periodic cost 1 3 1 7  
Foreign Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 1 1 4 4  
Interest cost 5 6 17 17  
Expected return on plan assets (8) (8) (25) (23)  
Amortization:          
Actuarial loss 2 2 7 5  
Prior service credit 0 0 0 0  
Settlement and curtailment (gain) loss 1 0 (2) 1  
Net periodic cost $ 1 $ 1 $ 1 $ 4