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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 1 $ 0 $ 4
Interest cost 1 1 4 7
Expected return on plan assets 0 0 0 0
Amortization:        
Actuarial loss 0 0 0 0
Prior service credit (12) (12) (35) (16)
Settlement and curtailment (gain) loss 0 0 0 (4)
Net periodic benefit cost (credit) (11) (10) (31) (9)
United States Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 2
Interest cost 20 25 58 74
Expected return on plan assets (39) (42) (118) (124)
Amortization:        
Actuarial loss 17 15 52 46
Prior service credit 0 0 0 0
Settlement and curtailment (gain) loss 2 0 5 0
Net periodic benefit cost (credit) 1 (1) (1) (2)
Foreign Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 4
Interest cost 4 4 11 13
Expected return on plan assets (9) (7) (26) (22)
Amortization:        
Actuarial loss 4 3 14 9
Prior service credit 0 0 0 0
Settlement and curtailment (gain) loss 0 1 0 1
Net periodic benefit cost (credit) $ 0 $ 2 $ 3 $ 5