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Derivative and Hedging Instruments - Summary of Effects of Net Investment Hedging Relationships (Detail) - Hedges of net investment in foreign operations [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 | $ (460) | $ 355
Gains (losses) reclassified from AOCI into investment income | 0 | 0
Ineffectiveness recognized in investment income | 0 | 0
Foreign Currency Forwards [member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | 9 |
Gains (losses) reclassified from AOCI into investment income | 0 |
Ineffectiveness recognized in investment income | 0 |
Non-functional currency denominated debt [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | (469) | 355
Gains (losses) reclassified from AOCI into investment income | 0 | 0
Ineffectiveness recognized in investment income | $ 0 | $ 0

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Gains (losses) deferred in accumulated other comprehensive income on derivatives. + References No definition available. + Details
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- Definition Gains (losses) reclassified from accumulated other comprehensive income into investment income. + References No definition available. + Details
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