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Derivative Financial Instruments - Summary of Effectiveness of Cash Flow and Net Investment Hedges on Consolidated Statement of Income and Consolidated Statement of Other Comprehensive Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Disclosure of information about amounts that affected statement of income and statement of comprehensive income as result of hedge accounting [line items] |  |
AOCI gains/ (losses) beginning of year | $ (6,190) | $ (10,271)
Net gains (losses) recognized in OCI | 2,576 | 5,311
Amount reclassified to net income as the hedged item affects net income | (2,354) | (1,230)
AOCI gains/ (losses) ending of year | (5,968) | (6,190)
Active hedges | (5,297) | (5,426)
Discountinued hedges | (671) | (764)
Cash flow hedges [member] |  |
Disclosure of information about amounts that affected statement of income and statement of comprehensive income as result of hedge accounting [line items] |  |
AOCI gains/ (losses) beginning of year | (3,015) | (6,210)
Net gains (losses) recognized in OCI | 3,937 | 5,195
Amount reclassified to net income as the hedged item affects net income | (2,493) | (2,000)
AOCI gains/ (losses) ending of year | (1,571) | (3,015)
Active hedges | (971) | (2,324)
Discountinued hedges | (600) | (691)
Cash flow hedges [member] | Interest rate risk [member] |  |
Disclosure of information about amounts that affected statement of income and statement of comprehensive income as result of hedge accounting [line items] |  |
AOCI gains/ (losses) beginning of year | (1,176) | (3,480)
Net gains (losses) recognized in OCI | 176 | 1,746
Amount reclassified to net income as the hedged item affects net income | 742 | 558
AOCI gains/ (losses) ending of year | (258) | (1,176)
Active hedges | 332 | (490)
Discountinued hedges | (590) | (686)
Cash flow hedges [member] | Currency or interest rate risk [member] |  |
Disclosure of information about amounts that affected statement of income and statement of comprehensive income as result of hedge accounting [line items] |  |
AOCI gains/ (losses) beginning of year | (699) | (2,007)
Net gains (losses) recognized in OCI | 168 | 1,356
Amount reclassified to net income as the hedged item affects net income | 249 | (48)
AOCI gains/ (losses) ending of year | (282) | (699)
Active hedges | (296) | (733)
Discountinued hedges | 14 | 34
Cash flow hedges [member] | Currency risk [member] |  |
Disclosure of information about amounts that affected statement of income and statement of comprehensive income as result of hedge accounting [line items] |  |
AOCI gains/ (losses) beginning of year | (1,197) | (703)
Net gains (losses) recognized in OCI | 3,236 | 1,830
Amount reclassified to net income as the hedged item affects net income | (3,165) | (2,324)
AOCI gains/ (losses) ending of year | (1,126) | (1,197)
Active hedges | (1,102) | (1,158)
Discountinued hedges | (24) | (39)
Cash flow hedges [member] | Equity price risk [member] |  |
Disclosure of information about amounts that affected statement of income and statement of comprehensive income as result of hedge accounting [line items] |  |
AOCI gains/ (losses) beginning of year | 57 | (20)
Net gains (losses) recognized in OCI | 357 | 263
Amount reclassified to net income as the hedged item affects net income | (319) | (186)
AOCI gains/ (losses) ending of year | 95 | 57
Active hedges | 95 | 57
Hedges of net investment in foreign operations [member] | Currency risk [member] |  |
Disclosure of information about amounts that affected statement of income and statement of comprehensive income as result of hedge accounting [line items] |  |
AOCI gains/ (losses) beginning of year | (3,175) | (4,061)
Net gains (losses) recognized in OCI | (1,361) | 116
Amount reclassified to net income as the hedged item affects net income | 139 | 770
AOCI gains/ (losses) ending of year | (4,397) | (3,175)
Active hedges | (4,326) | (3,102)
Discountinued hedges | $ (71) | $ (73)

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