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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, 2023 | Dec. 31, 2022 | Jan. 01, 2022
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | $ 212,149 | $ 203,842 | $ 224,139
Private placements | 45,606 | 42,010 | 47,289
Other invested assets | 45,680 | 42,803 | 35,291
Real estate | 13,049 | 14,269 | $ 14,269
Canadian Dollar Offered Rate [Member] | Interest Rate Benchmark Reform [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Floating rate invested assets | 167 | 173 |
Australia Dollars Bank Bill Swap Rate [Member] | Interest Rate Benchmark Reform [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Private placements | 198 | 199 |
Floating rate invested assets | 16 | 15 |
New Zealand Dollars Bank Bill Market Rate [Member] | Interest Rate Benchmark Reform [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Private placements | 61 | 43 |
Private equity [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total carrying value | 15,445 | 14,153 |
Less than 1 year [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 1,294 | 1,787 |
Private placements | 1,418 | 1,485 |
Less than 90 days [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 1,413 | 870 |
Fair value [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Private placements | 45,606 | 42,010 |
Change in the fair value of these invested assets | 49 | (94) |
Real estate own use property [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Real estate | 2,591 | 2,852 |
Real estate own use property [Member] | Fair value [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Real estate | 2,716 | 3,008 |
Real estate own use property [Member] | Fair value [Member] | Insurance Contracts with Direct Participating Features [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Real estate | 2,430 | 2,682 |
Real estate own use property [Member] | Carried at Cost [Member] | Insurance Contracts with Direct Participating Features [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Real estate | 161 | 170 |
Alternative long-duration assets [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets | 41,434 | 38,460 |
Alternative long-duration assets [Member] | Power and infrastructure [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total carrying value | 14,950 | 12,751 |
Alternative long-duration assets [Member] | Timber and agriculture [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total carrying value | 5,719 | 5,979 |
Alternative long-duration assets [Member] | Energy [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total carrying value | 1,859 | 2,347 |
Alternative long-duration assets [Member] | Other invested assets [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Total carrying value | 3,461 | 3,230 |
Alternative long-duration assets [Member] | Less than 1 year [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets |  | 1 |
Alternative long-duration assets [Member] | Fair value [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets | 42,313 | 39,225 |
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 | 6,162 | 4,148 |
Cash equivalents | 7,832 | 8,711 |
Cash | 6,344 | 6,294 |
Other [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets leveraged leases | 3,790 | 3,840 |
SPPI qualifying [member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets | 360 | 302 |
SPPI non qualifying [member] | Fair value [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Debt securities | 0 | 0 |
Private placements | 115 | 98 |
Other invested assets | $ 539 | $ 507 |

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