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Invested Assets and Investment Income - Schedule of Carrying Values and Fair Values of Invested Assets (Parenthetical) (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | $ 218,724,000 | $ 198,122,000
Private placements | 40,756,000 | 37,979,000
Other invested assets | 30,195,000 | 28,760,000
Public equities | 23,722,000 | 22,851,000
Less than 1 year [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | 1,971,000 | 537,000
Less than 90 days [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | 129,000 | 69,000
Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Private placements | 47,890,000 | 41,743,000
Change in the fair value of these invested assets | 44,000 | 71,000
Public equities | 23,722,000 | 22,851,000
Real estate own use property [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets |  | 1,926,000
Real estate own use property [Member] | Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets |  | 3,275,000
Alternative long-duration assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets | 26,172,000 | 24,843,000
Alternative long-duration assets [Member] | Private equity [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 7,954,000 | 6,396,000
Alternative long-duration assets [Member] | Power and infrastructure [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 9,127,000 | 8,854,000
Alternative long-duration assets [Member] | Oil and gas [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 2,296,000 | 3,245,000
Alternative long-duration assets [Member] | Timber and agriculture [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 4,819,000 | 4,669,000
Alternative long-duration assets [Member] | Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 1,976,000 | 1,679,000
Alternative long-duration assets [Member] | Hydroelectric Power [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value |  | 418,000
Alternative long-duration assets [Member] | Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets | 27,029,000 | 25,622,000
Cash and short-term securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Short-term securities with maturities of less than one year | 7,062,000 | 3,806,000
Cash equivalents | 13,331,000 | 11,136,000
Cash | 5,774,000 | 5,358,000
Other [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets leveraged leases | 3,371,000 | 3,371,000
SPPI qualifying [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets | 246 | 179
SPPI non qualifying [member] | Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | 94,000 | 98,000
Private placements | 211,000 | 257,000
Other invested assets | 380,000 | 373,000
ALDA strategy [member] | Public equity [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Public equities | 229,000 | 12,000
Accumulated depreciation and amortisation [Member] | Real estate own use property [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Accumulated depreciation of own use property | $ (376,000) | $ (414,000)

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