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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, 2018 | Dec. 31, 2017
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | $ (5) | $ 163
Gains (losses) reclassified from AOCI into investment income | 4 | 58
Ineffectiveness recognized in investment income | 0 | 0
Interest rate swaps [Member] | Forecasted liabilities [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) reclassified from AOCI into investment income | (20) | (17)
Ineffectiveness recognized in investment income | 0 | 0
Foreign currency swaps [Member] | Fixed rate assets [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives |  | 3
Gains (losses) reclassified from AOCI into investment income | (1) | (1)
Ineffectiveness recognized in investment income | 0 | 0
Foreign currency swaps [Member] | Floating rate liabilities [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | (36) | 95
Gains (losses) reclassified from AOCI into investment income | (62) | 50
Ineffectiveness recognized in investment income | 0 | 0
Foreign currency swaps [Member] | Fixed rate liabilities [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | 60 | 35
Gains (losses) reclassified from AOCI into investment income | 62 | 7
Ineffectiveness recognized in investment income | 0 | 0
Forward contracts [Member] | Forecasted expenses [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | (8) | 10
Gains (losses) reclassified from AOCI into investment income | (2) | (10)
Ineffectiveness recognized in investment income | 0 | 0
Equity contracts [Member] | Stock-based compensation [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | (21) | 20
Gains (losses) reclassified from AOCI into investment income | 27 | 29
Ineffectiveness recognized in investment income | $ 0 | $ 0

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