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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, 2020 | Dec. 31, 2019
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | $ 108 | $ 359
Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | (53) | 80
Non-functional currency denominated debt [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) deferred in AOCI on derivatives | $ 161 | $ 279

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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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