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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, 2023 | Dec. 31, 2022 | Jan. 01, 2022
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Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | $ 8,546 | $ 8,588 | $ 17,503
Total derivative liabilities | 11,730 | 14,289 | $ 10,038
Total derivative liabilities | 11,687 |  |
Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 5,813 | 5,919 |
Total derivative liabilities | 9,176 | 12,025 |
Foreign Exchange Contract [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 2,148 | 2,299 |
Total derivative liabilities | 2,396 | 2,039 |
Equity contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 582 | 366 |
Total derivative liabilities | 115 | 225 |
Credit default swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 3 | 4 |
Level 2 [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 7,985 | 8,429 |
Total derivative liabilities | 8,960 | 10,942 |
Level 2 [Member] | Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 5,262 | 5,766 |
Total derivative liabilities | 6,451 | 8,689 |
Level 2 [Member] | Foreign Exchange Contract [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 2,148 | 2,298 |
Total derivative liabilities | 2,395 | 2,037 |
Level 2 [Member] | Equity contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 572 | 361 |
Total derivative liabilities | 114 | 216 |
Level 2 [Member] | Credit default swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 3 | 4 |
Level 3 [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 561 | 159 |
Total derivative liabilities | 2,727 | 3,347 |
Level 3 [Member] | Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 551 | 153 |
Total derivative liabilities | 2,725 | 3,336 |
Level 3 [Member] | Foreign Exchange Contract [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets |  | 1 |
Total derivative liabilities | 1 | 2 |
Level 3 [Member] | Equity contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Total derivative assets | 10 | 5 |
Total derivative liabilities | $ 1 | $ 9 |

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