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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 2 $ 4 $ 5
Interest cost 1 4 7 12
Expected return on plan assets 0 0 0 0
Amortization:        
Actuarial loss 0 0 0 0
Prior service credit (12) (2) (16) (7)
Settlement and curtailment (gain) loss 0 0 (4) (7)
Net periodic benefit cost (credit) (10) 4 (9) 3
United States Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 2
Interest cost 25 30 74 92
Expected return on plan assets (42) (44) (124) (133)
Amortization:        
Actuarial loss 15 11 46 35
Prior service credit 0 (1) 0 (2)
Settlement and curtailment (gain) loss 0 10 0 10
Net periodic benefit cost (credit) (1) 7 (2) 4
Foreign Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 4
Interest cost 4 5 13 17
Expected return on plan assets (7) (6) (22) (21)
Amortization:        
Actuarial loss 3 2 9 6
Prior service credit 0 0 0 0
Settlement and curtailment (gain) loss 1 0 1 1
Net periodic benefit cost (credit) $ 2 $ 2 $ 5 $ 7