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Foreign Exchange (Gain) Loss, Net - Schedule of Foreign Exchange Gain Loss Net (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]        
Unrealized Foreign Exchange (Gain) Loss $ 59 $ 298 $ (99) $ 419
Realized Foreign Exchange (Gain) Loss 74 18 106 (13)
Total 133 316 7 406
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 28 324 (119) 444
Other        
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]        
Unrealized Foreign Exchange (Gain) Loss $ 31 $ (26) $ 20 $ (25)