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Derivative and Hedging Instruments - Summary of Fair Value and Fair Value Hierarchy of Derivative Instruments (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | $ 27,793 | $ 19,449
Total derivative liabilities | 14,962 | 10,284
Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 27,793 | 19,449
Total derivative liabilities | 14,962 | 10,284
Interest rate swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 25,735 | 17,894
Total derivative liabilities | 12,652 | 8,397
Foreign Exchange Contract [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 957 | 680
Total derivative liabilities | 2,244 | 1,850
Equity contracts [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 1,098 | 869
Total derivative liabilities | 66 | 37
Credit default swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 3 | 6
Level 2 [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 23,913 | 17,308
Total derivative liabilities | 14,525 | 9,599
Level 2 [Member] | Interest rate swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 21,902 | 15,801
Total derivative liabilities | 12,271 | 7,730
Level 2 [Member] | Foreign Exchange Contract [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 957 | 680
Total derivative liabilities | 2,239 | 1,849
Level 2 [Member] | Equity contracts [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 1,051 | 821
Total derivative liabilities | 15 | 20
Level 2 [Member] | Credit default swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 3 | 6
Level 3 [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 3,880 | 2,141
Total derivative liabilities | 437 | 685
Level 3 [Member] | Interest rate swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 3,833 | 2,093
Total derivative liabilities | 381 | 667
Level 3 [Member] | Foreign Exchange Contract [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative liabilities | 5 | 1
Level 3 [Member] | Equity contracts [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 47 | 48
Total derivative liabilities | $ 51 | $ 17

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