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Derivative and Hedging Instruments - Summary of Effects of Derivatives Not Designated in Qualifying Hedge Accounting Relationships (Detail) - Non designated [Member] - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) $ 1,173 $ (10,634)
Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) 667 (3,428)
Interest rate futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) 57 (431)
Interest rate options [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (13) (258)
Foreign currency swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (4) 1,171
Currency rate futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (22) (103)
Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) 612 (7,561)
Equity futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (449) 794
Equity contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) $ 325 $ (818)