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Derivative and Hedging Instruments - Summary of Effects of Derivatives in Cash Flow Hedging Relationships (Detail) - Cash flow hedges [Member] - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | $ 210 | $ 74
Gains (losses) reclassified from AOCI into investment income | (9) | (14)
Foreign currency swaps [Member] | Fixed rate assets [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | (1) | (1)
Gains (losses) reclassified from AOCI into investment income | (1) | (1)
Foreign currency swaps [Member] | Floating rate liabilities [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | 175 | 89
Gains (losses) reclassified from AOCI into investment income | (49) | 3
Foreign currency swaps [Member] | Fixed rate liabilities [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | 34 | (19)
Gains (losses) reclassified from AOCI into investment income | 35 | (21)
Equity contracts [Member] | Stock-based compensation [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | 2 | 5
Gains (losses) reclassified from AOCI into investment income | $ 6 | $ 5

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