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Insurance Contract Liabilities and Reinsurance Assets - Summary of Gross Claims and Benefits (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items]    
Gross claims and benefits $ 27,878 $ 24,994
Death, disability and other claims [Member]    
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items]    
Gross claims and benefits 15,174 14,871
Maturity and surrender benefits [Member]    
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items]    
Gross claims and benefits 7,722 6,302
Annuity payments [Member]    
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items]    
Gross claims and benefits 4,262 4,470
Policyholder dividends and experience rating refunds [Member]    
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items]    
Gross claims and benefits 1,809 1,085
Net transfers from segregated funds [Member]    
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items]    
Gross claims and benefits $ (1,089) $ (1,734)