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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 |

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