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Pension Benefit Plans (Details) - Pension Benefit Plans - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Canadian Pension Plans        
Amortization:        
Settlements   $ 8   $ 8
Funded Plan | U.S.        
Components of net periodic pension cost        
Service cost $ 3 3 $ 6 6
Interest cost 10 13 20 25
Expected asset return (21) (20) (42) (41)
Amortization:        
Amortization of actuarial loss 16 14 32 28
Net periodic pension cost 8 10 16 18
Funded Plan | Non-U.S.        
Components of net periodic pension cost        
Service cost 3 4 6 7
Interest cost 5 6 10 13
Expected asset return (11) (12) (23) (24)
Amortization:        
Amortization of actuarial loss $ 3 3 $ 7 6
Net periodic pension cost   $ 1   $ 2