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Income Taxes - Details of Income Tax Provision (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Canadian $ 63 $ 10
Foreign 408 302
Current income tax, Total 471 312
Canadian (4) 17
Foreign (72) 0
Deferred income tax, Total (76) 17
Income tax provision, Total $ 395 $ 329