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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 6 Months Ended 87 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 1 $ 2 $ 3 $ 4  
Interest cost 3 4 7 8  
Expected return on plan assets 0 0 0 0  
Amortization:          
Actuarial loss 0 0 0 0  
Prior service credit (2) (3) 1 (7)  
Settlement and curtailment (gain) loss 0 0 0 0  
Net periodic cost 2 3 11 5 $ (87)
United States Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 0 0 1 1  
Interest cost 29 33 59 67  
Expected return on plan assets (42) (44) (85) (88)  
Amortization:          
Actuarial loss 13 13 26 25  
Prior service credit 0 0 (1) (1)  
Settlement and curtailment (gain) loss 0 0 0 0  
Net periodic cost 0 2 0 4  
Foreign Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 2 2 3 3  
Interest cost 6 6 12 11  
Expected return on plan assets (9) (8) (17) (15)  
Amortization:          
Actuarial loss 2 1 5 3  
Prior service credit 0 0 0 0  
Settlement and curtailment (gain) loss (3) 1 (3) 1  
Net periodic cost $ (2) $ 2 $ 0 $ 3