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Pension and Other Postretirement Benefits - Components (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 $ 1 $ 0 $ 1 $ 0
Interest cost 1 0 2 2
Recognized prior service credit (6) (6) (19) (19)
Recognized net loss 1 1 3 3
Net periodic cost (benefit) (3) (5) (13) (14)
U.S. | Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 4 16 14
Interest cost 6 9 18 28
Expected return on plan assets (16) (18) (47) (55)
Recognized prior service credit 1 1 1 1
Recognized net loss 15 14 45 42
Net periodic cost (benefit) 11 10 33 30
Pension Benefits - Non-U.S. Plans | Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 3 10 9
Interest cost 9 14 27 40
Expected return on plan assets (20) (26) (61) (79)
Settlement loss 0 5 0 61
Recognized net loss 8 5 27 18
Net periodic cost (benefit) $ 0 $ 1 $ 3 $ 49