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Derivative and Hedging Instruments - Summary of Gross Notional Amount and Fair Value of Derivative Instruments (Detail) - CAD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 395,957,000,000 | $ 440,098,000,000
Fair value, assets | 8,588,000,000 | 17,503,000,000
Fair value, liabilities | 14,289,000,000 | 10,038,000,000
Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 5,919,000,000 | 14,971,000,000
Fair value, liabilities | 12,025,000,000 | 7,829,000,000
Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 366,000,000 | 1,677,000,000
Fair value, liabilities | 225,000,000 | 27,000,000
Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 4,000,000 | 1,000,000
Designated [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 2,002,000,000 | 2,124,000,000
Designated [Member] | Fair value hedges [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 48,000,000 | 57,000,000
Designated [Member] | Cash flow hedges [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 1,155,000,000 | 1,251,000,000
Designated [Member] | Cash flow hedges [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 173,000,000 | 145,000,000
Designated [Member] | Hedges of net investment in foreign operations [Member] | Foreign Currency Forwards [member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 626,000,000 | 671,000,000
Non designated [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 393,955,000,000 | 437,974,000,000
Non designated [Member] | Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 268,081,000,000 | 300,556,000,000
Non designated [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 39,667,000,000 | 36,405,000,000
Non designated [Member] | Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 45,124,000,000 | 45,295,000,000
Non designated [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 16,930,000,000 | 18,577,000,000
Non designated [Member] | Interest rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 11,772,000,000 | 11,944,000,000
Non designated [Member] | Interest rate options [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 6,090,000,000 | 10,708,000,000
Non designated [Member] | Currency rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 2,319,000,000 | 3,086,000,000
Non designated [Member] | Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 159,000,000 | 44,000,000
Non designated [Member] | Equity futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 3,813,000,000 | 11,359,000,000
Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 8,588,000,000 | 17,503,000,000
Fair value, liabilities | (14,289,000,000) | (10,038,000,000)
Fair value [Member] | Designated [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 48,000,000 | 25,000,000
Fair value, liabilities | 231,000,000 | 380,000,000
Fair value [Member] | Designated [Member] | Fair value hedges [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 5,000,000 | 1,000,000
Fair value, liabilities |  | 1,000,000
Fair value [Member] | Designated [Member] | Cash flow hedges [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 40,000,000 | 5,000,000
Fair value, liabilities | 203,000,000 | 379,000,000
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 | 10,000,000
Fair value [Member] | Designated [Member] | Hedges of net investment in foreign operations [Member] | Foreign Currency Forwards [member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets |  | 9,000,000
Fair value, liabilities | 28,000,000 | 0
Fair value [Member] | Non designated [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 8,540,000,000 | 17,478,000,000
Fair value, liabilities | 14,058,000,000 | 9,658,000,000
Fair value [Member] | Non designated [Member] | Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 5,751,000,000 | 11,832,000,000
Fair value, liabilities | 7,557,000,000 | 7,347,000,000
Fair value [Member] | Non designated [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 2,029,000,000 | 790,000,000
Fair value, liabilities | 1,579,000,000 | 1,722,000,000
Fair value [Member] | Non designated [Member] | Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 295,000,000 | 2,674,000,000
Fair value, liabilities | 4,697,000,000 | 562,000,000
Fair value [Member] | Non designated [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 363,000,000 | 1,667,000,000
Fair value, liabilities | 225,000,000 | 27,000,000
Fair value [Member] | Non designated [Member] | Interest rate options [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 98,000,000 | 514,000,000
Fair value [Member] | Non designated [Member] | Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | $ 4,000,000 | $ 1,000,000

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