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Accounting and Reporting Changes - Schedule of Financial Liabilities Under IAS 39 (Detail) - CAD ($) $ in Millions | Jan. 01, 2023 | Dec. 31, 2022
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Amortized cost [member] | IFRS 9 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
Impact of classification and measurement changes | $ 8,304 |
IFRS 9 Total carrying value | 78,125 |
Amortized cost [member] | IAS 39 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IAS 39 Total carrying value |  | $ 69,821
Investment contract liabilities [member] | FVTPL [member] | IFRS 9 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
Impact of classification and measurement changes | 2 |
IFRS 9 Total carrying value | 798 |
Investment contract liabilities [member] | FVTPL [member] | IAS 39 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IAS 39 Total carrying value |  | 796
Investment contract liabilities [member] | Amortized cost [member] | IFRS 9 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
Impact of classification and measurement changes | 6,829 |
IFRS 9 Total carrying value | 9,281 |
Investment contract liabilities [member] | Amortized cost [member] | IAS 39 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IAS 39 Total carrying value |  | 2,452
Deposits from bank clients [member] | Amortized cost [member] | IFRS 9 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IFRS 9 Total carrying value | 22,507 |
Deposits from bank clients [member] | Amortized cost [member] | IAS 39 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IAS 39 Total carrying value |  | 22,507
Derivative Liabilities [member] | FVTPL [member] | IFRS 9 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IFRS 9 Total carrying value | 14,289 |
Derivative Liabilities [member] | FVTPL [member] | IAS 39 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IAS 39 Total carrying value |  | 14,289
Other Liabilities [member] | Amortized cost [member] | IFRS 9 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
Impact of classification and measurement changes | 1,473 |
IFRS 9 Total carrying value | 18,894 |
Other Liabilities [member] | Amortized cost [member] | IAS 39 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IAS 39 Total carrying value |  | 17,421
Long-term borrowings [member] | Amortized cost [member] | IFRS 9 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IFRS 9 Total carrying value | 6,234 |
Long-term borrowings [member] | Amortized cost [member] | IAS 39 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IAS 39 Total carrying value |  | 6,234
Capital Instruments [member] | Amortized cost [member] | IFRS 9 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IFRS 9 Total carrying value | $ 6,122 |
Capital Instruments [member] | Amortized cost [member] | IAS 39 [Member] |  |
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] |  |
IAS 39 Total carrying value |  | $ 6,122

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