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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | $ 218,724 | $ 198,122 |
Public equities | 23,722 | 22,851 |
Real estate - investment property | 12,832 | 12,928 |
Other invested assets | 30,195 | 28,760 |
Segregated funds net assets | 367,436 | 343,108 |
Total assets | 880,349 | 809,130 |
FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Cash and short-term securities | 2,079 | 1,859 |
Debt securities | 128,297 | 116,044 |
Public equities | 22,071 | 20,060 |
AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Cash and short-term securities | 18,314 | 13,084 |
Debt securities | 6,566 | 5,285 |
Public equities | 1,651 | 2,791 |
Other cash and short-term securities [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Cash and short-term securities | 5,774 | 5,357 |
Real estate [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Real estate - investment property | 10,982 | 11,002 |
Other invested assets [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets | 19,149 | 18,194 |
Canadian government and agency [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 25,215 | 23,361 |
Canadian government and agency [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 20,667 | 18,582 |
Canadian government and agency [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 4,548 | 4,779 |
U.S. government and agency [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 11,449 | 11,031 |
U.S. government and agency [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 19,787 | 17,221 |
Other government and agency [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 24,345 | 21,743 |
Other government and agency [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 19,732 | 17,383 |
Other government and agency [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 4,613 | 4,360 |
Residential mortgage asset-backed securities [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 9 | 13 |
Residential mortgage asset-backed securities [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 1 | 1 |
Commercial mortgage asset-backed securities [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 1,172 | 1,271 |
Commercial mortgage asset-backed securities [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 93 | 102 |
Other securitized assets [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 1,735 | 1,983 |
Other securitized assets [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 55 | 67 |
Financial assets at fair value, class [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total assets | 666,180 | 613,577 |
Level 1 [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Segregated funds net assets | 327,437 | 303,567 |
Level 1 [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Public equities | 22,071 | 20,060 |
Level 1 [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Public equities | 1,651 | 2,788 |
Level 1 [Member] | Other cash and short-term securities [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Cash and short-term securities | 5,774 | 5,357 |
Level 1 [Member] | Other invested assets [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets | 100 | 91 |
Level 1 [Member] | Financial assets at fair value, class [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total assets | 357,033 | 331,863 |
Level 2 [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Segregated funds net assets | 35,797 | 35,029 |
Level 2 [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Cash and short-term securities | 2,079 | 1,859 |
Debt securities | 127,787 | 115,411 |
Level 2 [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Cash and short-term securities | 18,314 | 13,084 |
Debt securities | 6,563 | 5,270 |
Public equities |  | 3 |
Level 2 [Member] | Canadian government and agency [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 20,667 | 18,582 |
Level 2 [Member] | Canadian government and agency [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 4,548 | 4,779 |
Level 2 [Member] | U.S. government and agency [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 11,449 | 11,031 |
Level 2 [Member] | U.S. government and agency [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 19,787 | 17,221 |
Level 2 [Member] | Other government and agency [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 19,732 | 17,383 |
Level 2 [Member] | Other government and agency [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 4,613 | 4,360 |
Level 2 [Member] | Residential mortgage asset-backed securities [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 9 | 13 |
Level 2 [Member] | Residential mortgage asset-backed securities [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 1 | 1 |
Level 2 [Member] | Commercial mortgage asset-backed securities [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 1,172 | 1,271 |
Level 2 [Member] | Commercial mortgage asset-backed securities [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 93 | 102 |
Level 2 [Member] | Other securitized assets [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 1,690 | 1,983 |
Level 2 [Member] | Other securitized assets [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 55 | 67 |
Level 2 [Member] | Financial assets at fair value, class [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total assets | 274,356 | 247,449 |
Level 3 [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Segregated funds net assets | 4,202 | 4,512 |
Total assets | 38,234 | 35,721 | $ 34,009
Level 3 [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 510 | 633 |
Public equities | 0 |  |
Level 3 [Member] | AFS [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 3 | 15 |
Level 3 [Member] | Real estate [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Real estate - investment property | 10,982 | 11,002 |
Total assets | 30,589 | 29,753 | 29,456
Level 3 [Member] | Other invested assets [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets | 19,049 | 18,103 |
Level 3 [Member] | Other invested assets [Member] | Real estate [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total assets | 19,049 | 18,103 | $ 17,562
Level 3 [Member] | Other government and agency [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 0 |  |
Level 3 [Member] | Other securitized assets [Member] | FVTPL [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 45 |  |
Level 3 [Member] | Financial assets at fair value, class [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total assets | $ 34,791 | $ 34,265 |

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