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Foreign Exchange (Gain) Loss, Net - Schedule of Foreign Exchange Gain Loss Net (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]      
Unrealized Foreign Exchange (Gain) Loss $ 365 $ (312) $ (131)
Realized Foreign Exchange (Gain) Loss (22) 138 (50)
Total 343 (174) [1] (181) [1]
U.S. Dollar Debt Issued From Canada      
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]      
Unrealized Foreign Exchange (Gain) Loss 365 (230) (194)
Other      
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]      
Unrealized Foreign Exchange (Gain) Loss $ 0 $ (82) $ 63
[1] See Note 3X for revisions to prior period results.