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Accounting and Reporting Changes - Additional Information (Detail) - CAD ($) | Jan. 01, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021
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Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Allowance account for credit losses of financial assets |  | $ 929,000,000 | $ 724,000,000 |  |
Equity |  | 48,727,000,000 | 48,226,000,000 | $ 46,892,000,000 |
Notional amount |  | 440,077,000,000 | 395,957,000,000 |  |
Debt securities [member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Reclassification of financial assets out of measured at fair value through profit or loss into measured at fair value through other comprehensive income | $ 184,000,000,000 |  |  |  |
IFRS 9 [Member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Accumulated other comprehensive income amount cost of hedging | 22,000,000 |  |  |  |
Accumulated other comprehensive income other reclassifications | 0 |  |  |  |
Allowance account for credit losses of financial assets | 724,000,000 |  |  |  |
Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | IFRS 9 [Member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Notional amount | $ 232,637,000,000 |  |  |  |
Shareholders and other equity holders retained earnings [Member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity |  | 4,819,000,000 | 3,538,000,000 |  | $ 9,656,000,000
Shareholders and other equity holders retained earnings [Member] | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | IFRS 17 And IFRS 9 [Member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity |  | 409,000,000 | 10,645,000,000 |  |
Accumulated other comprehensive income [member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity |  | 13,811,000,000 | 14,261,000,000 |  | $ 5,963,000,000
Accumulated other comprehensive income [member] | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | IFRS 17 And IFRS 9 [Member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
AOCI Balances |  | $ 408,000,000 | $ 16,916,000,000 |  |

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