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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, 2022
Dec. 31, 2021
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) $ (10,634) $ (5,928)
Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (3,428) (1,986)
Interest rate futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (431) (687)
Interest rate options [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (258) (133)
Foreign currency swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) 1,171 (166)
Currency rate futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (103) 66
Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (7,561) (1,751)
Equity futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) 794 (2,140)
Equity contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) $ (818) 871
Credit default swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss)   $ (2)