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Invested Assets and Investment Income - Summary of Invested Assets and Segregated Funds Net Assets, Measured at Fair Value (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [Line Items]      
Debt securities $ 185,594 $ 174,000  
Public equities 19,179 21,545  
Real estate - investment property 12,777 13,810  
Other invested assets 27,543 24,483  
Segregated funds net assets 313,209 324,307  
Total assets 750,271 729,533  
FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 1,080 439  
Debt securities 107,425 96,785  
Public equities 16,721 18,473  
AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 10,163 11,429  
Debt securities 5,245 5,366  
Public equities 2,458 3,072  
Other cash and short-term securities [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 4,972 4,097  
Real estate [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Real estate - investment property 10,761 12,529  
Other invested assets [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Other invested assets 17,562 16,203  
Canadian government and agency [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 23,787 22,778  
Canadian government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 16,445 17,886  
Canadian government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 7,342 4,892  
U.S. government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 11,934 12,497  
U.S. government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 13,990 13,472  
Other government and agency [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 20,260 19,826  
Other government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 16,159 16,838  
Other government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 4,101 2,988  
Residential mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 13 8  
Residential mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 2 37  
Commercial mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,344 1,099  
Commercial mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 128 138  
Other securitized assets [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,417 1,911  
Other securitized assets [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 49 83  
Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 562,520 564,549  
Level 1 [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Segregated funds net assets 276,178 286,490  
Level 1 [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities   2  
Public equities 16,718 18,470  
Level 1 [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Public equities 2,456 3,069  
Level 1 [Member] | Other cash and short-term securities [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 4,972 4,097  
Level 1 [Member] | Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 300,324 312,128  
Level 2 [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Segregated funds net assets 32,584 33,562  
Level 2 [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 1,080 439  
Debt securities 106,641 96,073  
Level 2 [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 10,163 11,429  
Debt securities 5,125 5,278  
Public equities 2 3  
Level 2 [Member] | Canadian government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 16,445 17,886  
Level 2 [Member] | Canadian government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 7,342 4,892  
Level 2 [Member] | U.S. government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 11,934 12,497  
Level 2 [Member] | U.S. government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 13,990 13,472  
Level 2 [Member] | Other government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 15,979 16,599  
Level 2 [Member] | Other government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 4,064 2,941  
Level 2 [Member] | Residential mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 6 7  
Level 2 [Member] | Residential mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities   37  
Level 2 [Member] | Commercial mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,344 1,099  
Level 2 [Member] | Commercial mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 128 138  
Level 2 [Member] | Other securitized assets [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,417 1,886  
Level 2 [Member] | Other securitized assets [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 49 82  
Level 2 [Member] | Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 228,293 218,320  
Level 3 [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Segregated funds net assets 4,447 4,255  
Total assets 33,903 34,101 $ 33,282
Level 3 [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 784 710  
Public equities 3 3  
Level 3 [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 120 88  
Level 3 [Member] | Real estate [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Real estate - investment property 10,761 12,529  
Level 3 [Member] | Other invested assets [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Other invested assets 17,562 16,203  
Total assets 17,562 16,203 $ 14,849
Level 3 [Member] | Other government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 180 239  
Level 3 [Member] | Other government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 37 47  
Level 3 [Member] | Residential mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 7 1  
Level 3 [Member] | Residential mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 2    
Level 3 [Member] | Other securitized assets [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities   25  
Level 3 [Member] | Other securitized assets [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities   1  
Level 3 [Member] | Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets $ 33,903 $ 34,101