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Invested Assets and Investment Income - Summary of Remaining Term To Maturity for Invested Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021
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Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Cash and short-term securities | $ 20,338 | $ 19,153 | $ 22,594 | $ 22,594
Debt securities | 212,149 | 203,842 | 224,139 |
Public equities | 25,531 | 23,519 | 28,067 |
Mortgages | 52,421 | 51,765 | 53,948 |
Private placements | 45,606 | 42,010 | 47,289 |
Loans to Bank clients | 2,436 | 2,781 | 2,506 |
Real estate | 13,049 | 14,269 | 14,269 |
Other invested assets | 45,680 | 42,803 | 35,291 |
Total invested assets (note 4) | 417,210 | 400,142 | $ 428,103 |
Canadian government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 20,988 | 21,266 |  |
U.S. government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 28,478 | 24,736 |  |
Other government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 30,666 | 26,473 |  |
Corporate [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 130,046 | 129,079 |  |
Mortgage/asset-backed securities [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 1,971 | 2,288 |  |
Alternative long-duration assets [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 41,434 | 38,460 |  |
Various other [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 4,246 | 4,343 |  |
Real estate own use property [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Real estate | 2,591 | 2,852 |  |
Investment property [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Real estate | 10,458 | 11,417 |  |
Less than 1 year [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Cash and short-term securities | 20,338 | 19,153 |  |
Debt securities | 1,294 | 1,787 |  |
Public equities | 0 |  |  |
Mortgages | 3,363 | 3,288 |  |
Private placements | 1,418 | 1,485 |  |
Loans to Bank clients | 39 | 40 |  |
Total invested assets (note 4) | 35,105 | 34,252 |  |
Less than 1 year [Member] | Canadian government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 657 | 738 |  |
Less than 1 year [Member] | U.S. government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 297 | 380 |  |
Less than 1 year [Member] | Other government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 412 | 457 |  |
Less than 1 year [Member] | Corporate [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 8,475 | 8,599 |  |
Less than 1 year [Member] | Mortgage/asset-backed securities [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 106 | 6 |  |
Less than 1 year [Member] | Alternative long-duration assets [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets |  | 1 |  |
Less than 1 year [Member] | Various other [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets |  | 105 |  |
1 to 3 years [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Public equities | 0 |  |  |
Mortgages | 12,076 | 7,838 |  |
Private placements | 3,486 | 2,962 |  |
Loans to Bank clients | 23 | 18 |  |
Total invested assets (note 4) | 34,529 | 28,265 |  |
1 to 3 years [Member] | Canadian government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 1,435 | 1,242 |  |
1 to 3 years [Member] | U.S. government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 725 | 775 |  |
1 to 3 years [Member] | Other government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 1,052 | 753 |  |
1 to 3 years [Member] | Corporate [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 15,512 | 14,542 |  |
1 to 3 years [Member] | Mortgage/asset-backed securities [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 153 | 89 |  |
1 to 3 years [Member] | Alternative long-duration assets [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 67 | 46 |  |
3 to 5 years [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Public equities | 0 |  |  |
Mortgages | 10,181 | 10,911 |  |
Private placements | 4,704 | 4,090 |  |
Loans to Bank clients | 1 | 5 |  |
Total invested assets (note 4) | 37,970 | 36,610 |  |
3 to 5 years [Member] | Canadian government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 1,580 | 2,536 |  |
3 to 5 years [Member] | U.S. government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 744 | 505 |  |
3 to 5 years [Member] | Other government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 1,892 | 1,490 |  |
3 to 5 years [Member] | Corporate [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 18,548 | 16,767 |  |
3 to 5 years [Member] | Mortgage/asset-backed securities [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 279 | 265 |  |
3 to 5 years [Member] | Alternative long-duration assets [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 22 | 22 |  |
3 to 5 years [Member] | Various other [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 19 | 19 |  |
5 to 10 years [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Public equities | 0 |  |  |
Mortgages | 7,690 | 7,906 |  |
Private placements | 9,137 | 7,958 |  |
Loans to Bank clients | 0 |  |  |
Total invested assets (note 4) | 64,378 | 64,932 |  |
5 to 10 years [Member] | Canadian government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 3,656 | 3,811 |  |
5 to 10 years [Member] | U.S. government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 4,504 | 3,560 |  |
5 to 10 years [Member] | Other government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 3,864 | 3,801 |  |
5 to 10 years [Member] | Corporate [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 33,361 | 36,778 |  |
5 to 10 years [Member] | Mortgage/asset-backed securities [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 556 | 574 |  |
5 to 10 years [Member] | Alternative long-duration assets [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 82 | 35 |  |
5 to 10 years [Member] | Various other [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 1,528 | 509 |  |
Over 10 years [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Public equities | 0 |  |  |
Mortgages | 9,644 | 11,629 |  |
Private placements | 26,790 | 25,440 |  |
Loans to Bank clients | 0 | 2 |  |
Total invested assets (note 4) | 153,699 | 147,124 |  |
Over 10 years [Member] | Canadian government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 13,660 | 12,939 |  |
Over 10 years [Member] | U.S. government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 22,208 | 19,516 |  |
Over 10 years [Member] | Other government and agency [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 23,446 | 19,972 |  |
Over 10 years [Member] | Corporate [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 54,100 | 52,392 |  |
Over 10 years [Member] | Mortgage/asset-backed securities [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 877 | 1,354 |  |
Over 10 years [Member] | Alternative long-duration assets [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 732 | 674 |  |
Over 10 years [Member] | Various other [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 2,242 | 3,206 |  |
With no specific maturity [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Public equities | 25,531 | 23,519 |  |
Mortgages | 9,467 | 10,193 |  |
Private placements | 71 | 75 |  |
Loans to Bank clients | 2,373 | 2,716 |  |
Total invested assets (note 4) | 91,529 | 88,959 |  |
With no specific maturity [Member] | Corporate [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Debt securities | 50 | 1 |  |
With no specific maturity [Member] | Alternative long-duration assets [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 40,531 | 37,682 |  |
With no specific maturity [Member] | Various other [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Other invested assets | 457 | 504 |  |
With no specific maturity [Member] | Real estate own use property [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Real estate | 2,591 | 2,852 |  |
With no specific maturity [Member] | Investment property [Member] |  |  |  |
Disclosure of Detailed Information About Remaining Term to Maturity for Invested Assets [Line Items] |  |  |  |
Real estate | $ 10,458 | $ 11,417 |  |

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