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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, 2018
Dec. 31, 2017
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) $ (2,258) $ (1,024)
Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (1,894) (927)
Interest rate futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (298) 372
Interest rate options [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (52) (96)
Foreign currency swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (122) 529
Currency rate futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) 3 (92)
Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (355) 1,231
Equity futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) 742 (2,190)
Equity contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) (276) 153
Credit default swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative investment income (loss) $ (6) $ (4)