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Pension Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
U.S.        
Components of net periodic pension cost        
Service cost $ 3 $ 3 $ 9 $ 9
Interest cost 12 15 37 45
Expected asset return (19) (22) (60) (65)
Amortization:        
Amortization of actuarial loss 14 10 42 30
Net periodic pension cost 10 6 28 19
Non-U.S.        
Components of net periodic pension cost        
Service cost 3 3 10 9
Interest cost 6 7 19 22
Expected asset return (12) (11) (36) (33)
Amortization:        
Amortization of actuarial loss 3 3 9 7
Net periodic pension cost   $ 2 2 $ 5
Pension Benefit Plans | Canadian Pension Plans        
Amortization:        
Settlements     $ 8  
Other Post-retirement Benefits | U.S.        
Amortization:        
Decrease in postretirement benefit obligation $ 32