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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
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 3 $ 3
Interest cost 3 4 6 8
Expected return on plan assets 0 0 0 0
Amortization:        
Actuarial loss 0 0 0 0
Prior service credit (2) (3) (4) (5)
Settlement and curtailment (gain) loss (4) 0 (4) (7)
Net periodic benefit cost (credit) (2) 2 1 (1)
United States Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 1 1
Interest cost 24 31 49 62
Expected return on plan assets (41) (45) (82) (89)
Amortization:        
Actuarial loss 16 12 31 24
Prior service credit 0 0 0 (1)
Settlement and curtailment (gain) loss 0 0 0 0
Net periodic benefit cost (credit) (1) (2) (1) (3)
Foreign Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 2 3 3
Interest cost 5 6 9 12
Expected return on plan assets (7) (8) (15) (15)
Amortization:        
Actuarial loss 3 2 6 4
Prior service credit 0 0 0 0
Settlement and curtailment (gain) loss 0 0 0 1
Net periodic benefit cost (credit) $ 2 $ 2 $ 3 $ 5