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Foreign Exchange (Gain) Loss, Net - Schedule of Foreign Exchange Gain Loss Net (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]        
Unrealized Foreign Exchange (Gain) Loss $ 260 $ (192) $ 121 $ (331)
Realized Foreign Exchange (Gain) Loss (68) 20 (31) 42
Total 192 (172) [1] 90 (289) [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 273 (150) 120 (280)
Other        
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]        
Unrealized Foreign Exchange (Gain) Loss $ (13) $ (42) $ 1 $ (51)
[1] See Note 3 for revisions to prior period results.