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Invested Assets and Investment Income - Schedule of Carrying Values and Fair Values of Invested Assets (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | $ 203,904 | $ 224,139
Private placements | 47,057 | 42,842
Other invested assets | 42,783 | 35,306
Public equities | 23,519 | 28,067
Canadian Dollar Offered Rate [Member] | Interest Rate Benchmark Reform [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Floating rate invested assets | 173 | 176
US Dollars London Interbank Offered Rate [Member] | Interest Rate Benchmark Reform [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Private placements | 1,613 | 1,984
Floating rate invested assets | 892 | 1,002
Australia Dollars Bank Bill Swap Rate [Member] | Interest Rate Benchmark Reform [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Private placements | 199 | 166
Floating rate invested assets | 15 | 0
New Zealand Dollars Bank Bill Market Rate [Member] | Interest Rate Benchmark Reform [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Private placements | 43 | 43
Private equity [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 14,279 |
Less than 1 year [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | 1,787 | 2,196
Less than 90 days [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | 870 | 347
Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Private placements | 41,968 | 47,276
Change in the fair value of these invested assets | (94) | 15
Public equities | 23,519 | 28,067
Alternative long-duration assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets | 38,439 | 31,204
Alternative long-duration assets [Member] | Private equity [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value |  | 11,598
Alternative long-duration assets [Member] | Power and infrastructure [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 12,761 | 9,824
Alternative long-duration assets [Member] | Oil and gas [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 2,221 | 1,950
Alternative long-duration assets [Member] | Timber and agriculture [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 5,979 | 5,259
Alternative long-duration assets [Member] | Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 3,199 | 2,573
Alternative long-duration assets [Member] | Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets | 39,225 | 31,863
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 | 4,148 | 7,314
Cash equivalents | 8,711 | 9,239
Cash | 6,294 | 6,041
Other [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets leveraged leases | 3,840 | 3,457
SPPI qualifying [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets | 302 | 323
SPPI non qualifying [member] | Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | 0 | 0
Private placements | 98 | 181
Other invested assets | 507 | 518
ALDA strategy [member] | Public equity [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Public equities | 1 | 5
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 | $ 411 | $ 407

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