Summary of significant accounting policies, estimates and judgments - Summary of Undrawn Balances of Loan Commitments (Detail) - CAD ($) $ in Millions |
Oct. 31, 2022 |
Oct. 31, 2021 |
|---|---|---|
| Disclosure of Undrawn Balances of Loan Commitments Referencing Benchmark Interest Rates [Line Items] | ||
| Authorized and committed undrawn commitments | $ 86,184 | $ 138,081 |
| USD LIBOR [member] | ||
| Disclosure of Undrawn Balances of Loan Commitments Referencing Benchmark Interest Rates [Line Items] | ||
| Authorized and committed undrawn commitments | 59,271 | 122,437 |
| CDOR [Member] | ||
| Disclosure of Undrawn Balances of Loan Commitments Referencing Benchmark Interest Rates [Line Items] | ||
| Authorized and committed undrawn commitments | $ 26,913 | $ 15,644 |