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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
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2 $ 2 $ 5 $ 5
Interest cost 4 3 12 10
Expected return on plan assets 0 0 0 0
Amortization:        
Actuarial loss 0 0 0 0
Prior service credit (2) (3) (7) (2)
Settlement and curtailment (gain) loss 0 4 (7) 4
Net periodic cost 4 6 3 17
United States Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 2
Interest cost 30 30 92 89
Expected return on plan assets (44) (43) (133) (128)
Amortization:        
Actuarial loss 11 14 35 40
Prior service credit (1) (1) (2) (2)
Settlement and curtailment (gain) loss 10 0 10 0
Net periodic cost 7 1 4 1
Foreign Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 4
Interest cost 5 5 17 17
Expected return on plan assets (6) (8) (21) (25)
Amortization:        
Actuarial loss 2 2 6 7
Prior service credit 0 0 0 0
Settlement and curtailment (gain) loss 0 1 1 (2)
Net periodic cost $ 2 $ 1 $ 7 $ 1