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Invested Assets and Investment Income - Summary of Fair Values Categorized by the Fair Value Hierarchy (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Carrying value [Member]    
Disclosure of financial assets [Line Items]    
Carrying value CAD 93,980 CAD 90,995
Carrying value [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 44,742 44,193
Carrying value [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 32,132 29,729
Carrying value [Member] | Policy loans [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 5,808 6,041
Carrying value [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 1,737 1,745
Carrying value [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 1,281 1,376
Carrying value [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 8,280 7,911
Fair value [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 99,246 95,689
Fair value [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 46,065 45,665
Fair value [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 34,581 31,459
Fair value [Member] | Policy loans [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 5,808 6,041
Fair value [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 1,742 1,746
Fair value [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 2,448 2,524
Fair value [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 8,602 8,254
Level 1 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 88 54
Level 1 [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 88 54
Level 2 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 36,064 33,860
Level 2 [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 28,514 26,073
Level 2 [Member] | Policy loans [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 5,808 6,041
Level 2 [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 1,742 1,746
Level 3 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 63,094 61,775
Level 3 [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 46,065 45,665
Level 3 [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 6,067 5,386
Level 3 [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 2,448 2,524
Level 3 [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value CAD 8,514 CAD 8,200