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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 99 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 1 $ 1 $ 3 $ 3  
Interest cost 4 3 8 7  
Expected return on plan assets 0 0 0 0  
Amortization:          
Actuarial loss 0 0 0 0  
Prior service credit (3) (2) (5) 1  
Settlement and curtailment (gain) loss 0 0 (7) 0  
Net periodic benefit cost (credit) 2 2 (1) 11 $ (89)
United States Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 0 0 1 1  
Interest cost 31 29 62 59  
Expected return on plan assets (45) (42) (89) (85)  
Amortization:          
Actuarial loss 12 13 24 26  
Prior service credit 0 0 (1) (1)  
Settlement and curtailment (gain) loss 0 0 0 0  
Net periodic benefit cost (credit) (2) 0 (3) 0  
Foreign Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 2 2 3 3  
Interest cost 6 6 12 12  
Expected return on plan assets (8) (9) (15) (17)  
Amortization:          
Actuarial loss 2 2 4 5  
Prior service credit 0 0 0 0  
Settlement and curtailment (gain) loss 0 (3) 1 (3)  
Net periodic benefit cost (credit) $ 2 $ (2) $ 5 $ 0