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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, 2022 | Dec. 31, 2021
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Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | $ 8,588 | $ 17,503
Total derivative liabilities | 14,289 | 10,038
Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 5,919 | 14,971
Total derivative liabilities | 12,025 | 7,829
Foreign Exchange Contract [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 2,299 | 854
Total derivative liabilities | 2,039 | 2,182
Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 366 | 1,677
Total derivative liabilities | 225 | 27
Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 4 | 1
Level 2 [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 8,429 | 14,981
Total derivative liabilities | 10,942 | 9,617
Level 2 [Member] | Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 5,766 | 12,510
Total derivative liabilities | 8,689 | 7,419
Level 2 [Member] | Foreign Exchange Contract [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 2,298 | 854
Total derivative liabilities | 2,037 | 2,181
Level 2 [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 361 | 1,616
Total derivative liabilities | 216 | 17
Level 2 [Member] | Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 4 | 1
Level 3 [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 159 | 2,522
Total derivative liabilities | 3,347 | 421
Level 3 [Member] | Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 153 | 2,461
Total derivative liabilities | 3,336 | 410
Level 3 [Member] | Foreign Exchange Contract [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 1 |
Total derivative liabilities | 2 | 1
Level 3 [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 5 | 61
Total derivative liabilities | $ 9 | $ 10

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