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Capital Stock - Summary of Normal Course Issuer Bids (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Share Repurchase Programs [Line Items]    
Shares purchased 5,992,323 5,077,882
Cash amount $ 517 $ 203
2019 Bid [Member]    
Schedule Of Share Repurchase Programs [Line Items]    
Shares purchased 0 5,077,882
Cash amount $ 0 $ 203
2020 Bid [Member]    
Schedule Of Share Repurchase Programs [Line Items]    
Shares purchased 3,318,523 0
Cash amount $ 301 $ 0
2021 Bid [Member]    
Schedule Of Share Repurchase Programs [Line Items]    
Shares purchased 2,673,800 0
Cash amount $ 216 $ 0