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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, 2020 | Dec. 31, 2019
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | $ (79) | $ (48)
Gains (losses) reclassified from AOCI into investment income | 28 | (15)
Foreign currency swaps [Member] | Fixed rate assets [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | 1 | (2)
Gains (losses) reclassified from AOCI into investment income |  | 1
Foreign currency swaps [Member] | Floating rate liabilities [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | (64) | (40)
Gains (losses) reclassified from AOCI into investment income | 14 | 37
Foreign currency swaps [Member] | Fixed rate liabilities [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | (14) | (41)
Gains (losses) reclassified from AOCI into investment income | (2) | (35)
Forward contracts [Member] | Forecasted expenses [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) reclassified from AOCI into investment income |  | (9)
Equity contracts [Member] | Stock-based compensation [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | (2) | 35
Gains (losses) reclassified from AOCI into investment income | $ 16 | $ (9)

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