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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]      
Unrealized Foreign Exchange (Gain) Loss $ (312) $ (131) $ (827)
Realized Foreign Exchange (Gain) Loss 138 (50) 423
Total (174) (181) [1] (404) [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 (230) (194) (800)
Other      
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]      
Unrealized Foreign Exchange (Gain) Loss $ (82) $ 63 $ (27)
[1] See Note 3(w) for revisions to comparative results.