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Capital Stock - Summary of Normal Course Issuer Bids (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Share Repurchase Programs [Line Items]    
Shares purchased 4,649,963 239,296
Cash amount $ 207 $ 13
2022 Bid [Member]    
Schedule Of Share Repurchase Programs [Line Items]    
Shares purchased 0 239,296
Cash amount $ 0 $ 13
Prior 2024 Bid [Member]    
Schedule Of Share Repurchase Programs [Line Items]    
Shares purchased 98,636 0
Cash amount $ 5 $ 0
2024 Bid [Member]    
Schedule Of Share Repurchase Programs [Line Items]    
Shares purchased 4,551,327 0
Cash amount $ 202 $ 0