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Invested Assets and Investment Income - Additional Information (Detail) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of fair value measurement of assets [Line Items] |  |
Fair value of securitized assets | $ 880,349,000,000 | $ 809,130,000,000
Fair value of securitized liabilities | 827,343,000,000 | 759,024,000,000
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | 0 | 0
Investment property | 12,832,000,000 | 12,928,000,000
Oil And Gas Investments Property [Member] | Bottom of range [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Investment property | 837,000,000 |
Segregated funds [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | 0 | 0
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period | 15,000,000 | 0
Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Profit (loss) from associates and joint ventures | 315,000,000 | 369,000,000
Dividends received from associates and joint ventures | 2,000,000 | 2,000,000
Securitized assets [Member] | Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Fair value of securitized assets | 4,679,000,000 | 3,950,000,000
Fair value of securitized liabilities | $ 4,661,000,000 | 3,879,000,000
North American Private Equity [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Equity Investments Sold to Related Partners |  | $ 1,112,000,000

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