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Invested Assets and Investment Income - Summary of Fair Values and the Fair Value Hierarchy (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Carrying value [Member]    
Disclosure of financial assets [Line Items]    
Carrying value $ 104,353 $ 93,980
Carrying value [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 48,363 44,742
Carrying value [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 35,754 32,132
Carrying value [Member] | Policy loans [member]    
Disclosure of financial assets [Line Items]    
Carrying value 6,446 5,808
Carrying value [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 1,793 1,737
Carrying value [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 2,016 1,281
Carrying value [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 9,981 8,280
Fair value [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 106,906 99,246
Fair value [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 48,628 46,065
Fair value [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 36,103 34,581
Fair value [Member] | Policy loans [member]    
Disclosure of financial assets [Line Items]    
Total fair value 6,446 5,808
Fair value [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 1,797 1,742
Fair value [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 3,179 2,448
Fair value [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 10,753 8,602
Level 1 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 121 88
Level 1 [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 121 88
Level 2 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 38,568 36,064
Level 2 [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 30,325 28,514
Level 2 [Member] | Policy loans [member]    
Disclosure of financial assets [Line Items]    
Total fair value 6,446 5,808
Level 2 [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 1,797 1,742
Level 3 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 68,217 63,094
Level 3 [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 48,628 46,065
Level 3 [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 5,778 6,067
Level 3 [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 3,179 2,448
Level 3 [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value $ 10,632 $ 8,514