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Per Share Amounts - Additional Information (Detail) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Nov. 01, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disclosure of non-adjusting events after reporting period [line items]          
Total dividends paid on preferred shares   $ 9 $ 9 $ 27 $ 26
Stock Options With Associated Net Settlement Rights          
Disclosure of non-adjusting events after reporting period [line items]          
Instruments excluded from calculation, shares (in shares)   1.5 2.0 1.5 2.0
Common shares          
Disclosure of non-adjusting events after reporting period [line items]          
Instruments excluded from calculation   $ 6     $ 35
Instruments excluded from calculation, shares (in shares)   0.6     1.6
Variable dividends declared ( in CAD per share)       $ 0 $ 0
Preference shares          
Disclosure of non-adjusting events after reporting period [line items]          
Total dividends paid on preferred shares   $ 0 $ 9 $ 27 $ 26
Potential ordinary share transactions | Common shares          
Disclosure of non-adjusting events after reporting period [line items]          
Dividends declared (in CAD per share) $ 0.140        
Potential ordinary share transactions | Preference shares          
Disclosure of non-adjusting events after reporting period [line items]          
Dividends declared $ 9