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Insurance Contract Liabilities and Reinsurance Assets - Summary of Gross Claims and Benefits (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items]
Gross claims and benefits	CAD 24,994	CAD 25,059
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	14,871	13,819
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	6,302	6,697
Annuity payments [Member]
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items]
Gross claims and benefits	4,470	4,310
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	1,085	1,111
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	CAD (1,734)	CAD (878)