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Derivative and Hedging Instruments - Summary of Gross Notional Amount and Fair Value of Derivative Instruments (Detail) - CAD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022
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Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | $ 440,077,000,000 | $ 395,957,000,000 |
Fair value, assets | 8,546,000,000 | 8,588,000,000 | $ 17,503,000,000
Fair value, liabilities | (11,730,000,000) | (14,289,000,000) | $ (10,038,000,000)
Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 5,813,000,000 | 5,919,000,000 |
Fair value, liabilities | (9,176,000,000) | (12,025,000,000) |
Equity contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 582,000,000 | 366,000,000 |
Fair value, liabilities | (115,000,000) | (225,000,000) |
Credit default swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 3,000,000 | 4,000,000 |
Designated [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 227,241,000,000 | 2,002,000,000 |
Designated [Member] | Fair value hedges [Member] | Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 184,309,000,000 |  |
Designated [Member] | Fair value hedges [Member] | Foreign currency swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 9,055,000,000 | 48,000,000 |
Designated [Member] | Fair value hedges [Member] | Forward contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 23,461,000,000 |  |
Designated [Member] | Cash flow hedges [Member] | Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 8,372,000,000 |  |
Designated [Member] | Cash flow hedges [Member] | Foreign currency swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 1,150,000,000 | 1,155,000,000 |
Designated [Member] | Cash flow hedges [Member] | Equity contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 240,000,000 | 173,000,000 |
Designated [Member] | Net investment hedges [Member] | Forward contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 654,000,000 | 626,000,000 |
Non designated [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 212,836,000,000 | 393,955,000,000 |
Non designated [Member] | Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 103,806,000,000 | 268,081,000,000 |
Non designated [Member] | Foreign currency swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 33,148,000,000 | 39,667,000,000 |
Non designated [Member] | Forward contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 34,080,000,000 | 45,124,000,000 |
Non designated [Member] | Equity contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 19,760,000,000 | 16,930,000,000 |
Non designated [Member] | Interest rate futures [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 9,449,000,000 | 11,772,000,000 |
Non designated [Member] | Interest rate options [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 5,841,000,000 | 6,090,000,000 |
Non designated [Member] | Currency rate futures [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 2,581,000,000 | 2,319,000,000 |
Non designated [Member] | Credit default swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 131,000,000 | 159,000,000 |
Non designated [Member] | Equity futures [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Notional amount | 4,040,000,000 | 3,813,000,000 |
Fair value [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 8,546,000,000 | 8,588,000,000 |
Fair value, liabilities | 11,687,000,000 | 14,289,000,000 |
Fair value [Member] | Designated [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 2,928,000,000 | 48,000,000 |
Fair value, liabilities | 7,479,000,000 | 231,000,000 |
Fair value [Member] | Designated [Member] | Fair value hedges [Member] | Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 2,627,000,000 |  |
Fair value, liabilities | 3,044,000,000 |  |
Fair value [Member] | Designated [Member] | Fair value hedges [Member] | Foreign currency swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 78,000,000 | 5,000,000 |
Fair value, liabilities | 1,518,000,000 |  |
Fair value [Member] | Designated [Member] | Fair value hedges [Member] | Forward contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 165,000,000 |  |
Fair value, liabilities | 2,672,000,000 |  |
Fair value [Member] | Designated [Member] | Cash flow hedges [Member] | Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 20,000,000 |  |
Fair value, liabilities | 48,000,000 |  |
Fair value [Member] | Designated [Member] | Cash flow hedges [Member] | Foreign currency swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 35,000,000 | 40,000,000 |
Fair value, liabilities | 181,000,000 | 203,000,000 |
Fair value [Member] | Designated [Member] | Cash flow hedges [Member] | Equity contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 3,000,000 | 3,000,000 |
Fair value [Member] | Designated [Member] | Net investment hedges [Member] | Forward contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, liabilities | 16,000,000 | 28,000,000 |
Fair value [Member] | Non designated [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 5,618,000,000 | 8,540,000,000 |
Fair value, liabilities | 4,208,000,000 | 14,058,000,000 |
Fair value [Member] | Non designated [Member] | Interest rate swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 2,361,000,000 | 5,751,000,000 |
Fair value, liabilities | 3,098,000,000 | 7,557,000,000 |
Fair value [Member] | Non designated [Member] | Foreign currency swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 1,873,000,000 | 2,029,000,000 |
Fair value, liabilities | 398,000,000 | 1,579,000,000 |
Fair value [Member] | Non designated [Member] | Forward contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 769,000,000 | 295,000,000 |
Fair value, liabilities | 597,000,000 | 4,697,000,000 |
Fair value [Member] | Non designated [Member] | Equity contracts [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 579,000,000 | 363,000,000 |
Fair value, liabilities | 115,000,000 | 225,000,000 |
Fair value [Member] | Non designated [Member] | Interest rate options [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | 33,000,000 | 98,000,000 |
Fair value [Member] | Non designated [Member] | Credit default swaps [Member] |  |  |
Disclosure of detailed information about hedges [Line Items] |  |  |
Fair value, assets | $ 3,000,000 | $ 4,000,000 |

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