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Securities - Summary of Residual Term to Contractual Maturity of Financial Instruments (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 88,905 | $ 76,693
Securities measured at amortized cost | 65,471 | 71,610
Corporate equity mandatorily measured at FVTPL and designated at FVOCI | 76,797 | 61,460
Total securities | 283,235 | 254,345
Canadian federal government [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | 15,523 | 11,685
Securities measured at amortized cost | 3,493 | 2,904
Debt securities mandatorily measured and designated at FVTPL | $ 16,805 | $ 17,799
Debt securities measured at FVOCI, yield | 3.40% | 3.80%
Securities measured at amortized cost, yield | 2.90% | 2.50%
Other canadian governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 16,493 | $ 16,414
Securities measured at amortized cost | 19,997 | 21,634
Debt securities mandatorily measured and designated at FVTPL | $ 10,484 | $ 9,909
Debt securities measured at FVOCI, yield | 3.10% | 3.20%
Securities measured at amortized cost, yield | 2.90% | 3.00%
U.S. Treasury and agencies [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 33,351 | $ 29,152
Securities measured at amortized cost | 29,090 | 33,727
Debt securities mandatorily measured and designated at FVTPL | $ 12,498 | $ 6,750
Debt securities measured at FVOCI, yield | 3.60% | 3.90%
Securities measured at amortized cost, yield | 2.80% | 2.50%
Other foreign governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 7,756 | $ 5,560
Securities measured at amortized cost | 1,556 | 1,527
Debt securities mandatorily measured and designated at FVTPL | $ 1,070 | $ 2,128
Debt securities measured at FVOCI, yield | 3.70% | 4.40%
Securities measured at amortized cost, yield | 2.70% | 2.50%
Mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 3,709 | $ 3,470
Securities measured at amortized cost | 4,533 | 5,297
Debt securities mandatorily measured and designated at FVTPL | $ 5,609 | $ 3,980
Debt securities measured at FVOCI, yield | 3.60% | 4.10%
Securities measured at amortized cost, yield | 2.70% | 3.30%
Asset backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 947 | $ 657
Securities measured at amortized cost | 2,357 | 2,236
Debt securities mandatorily measured and designated at FVTPL | $ 1,976 | $ 303
Debt securities measured at FVOCI, yield | 4.70% | 5.90%
Securities measured at amortized cost, yield | 5.50% | 6.00%
Corporate debt [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 10,106 | $ 9,083
Securities measured at amortized cost | 4,445 | 4,285
Debt securities mandatorily measured and designated at FVTPL | $ 4,640 | $ 4,385
Debt securities measured at FVOCI, yield | 4.30% | 4.70%
Securities measured at amortized cost, yield | 3.20% | 3.30%
Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 87,885 | $ 76,021
Debt securities mandatorily measured and designated at FVTPL | 53,082 | $ 45,254
Within 1 year [member] |  |
Disclosure of financial assets [line items] |  |
Securities measured at amortized cost | 12,190 |
Total securities | 42,698 |
Within 1 year [member] | Canadian federal government [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | 2,922 |
Securities measured at amortized cost | 431 |
Debt securities mandatorily measured and designated at FVTPL | $ 2,409 |
Debt securities measured at FVOCI, yield | 4.00% |
Securities measured at amortized cost, yield | 0.80% |
Within 1 year [member] | Other canadian governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 487 |
Securities measured at amortized cost | 1,561 |
Debt securities mandatorily measured and designated at FVTPL | $ 1,728 |
Debt securities measured at FVOCI, yield | 2.40% |
Securities measured at amortized cost, yield | 1.80% |
Within 1 year [member] | U.S. Treasury and agencies [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 12,651 |
Securities measured at amortized cost | 8,261 |
Debt securities mandatorily measured and designated at FVTPL | $ 698 |
Debt securities measured at FVOCI, yield | 3.30% |
Securities measured at amortized cost, yield | 1.60% |
Within 1 year [member] | Other foreign governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 4,076 |
Securities measured at amortized cost | 369 |
Debt securities mandatorily measured and designated at FVTPL | $ 212 |
Debt securities measured at FVOCI, yield | 3.20% |
Securities measured at amortized cost, yield | 3.00% |
Within 1 year [member] | Mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 189 |
Securities measured at amortized cost | 441 |
Debt securities mandatorily measured and designated at FVTPL | $ 572 |
Debt securities measured at FVOCI, yield | 3.90% |
Securities measured at amortized cost, yield | 2.80% |
Within 1 year [member] | Asset backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 516 |
Securities measured at amortized cost | 147 |
Debt securities mandatorily measured and designated at FVTPL | $ 278 |
Debt securities measured at FVOCI, yield | 4.60% |
Securities measured at amortized cost, yield | 5.70% |
Within 1 year [member] | Corporate debt [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 3,011 |
Securities measured at amortized cost | 980 |
Debt securities mandatorily measured and designated at FVTPL | $ 759 |
Debt securities measured at FVOCI, yield | 4.20% |
Securities measured at amortized cost, yield | 1.90% |
Within 1 year [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 23,852 |
Debt securities mandatorily measured and designated at FVTPL | 6,656 |
Later than one year and not later than five years [member] |  |
Disclosure of financial assets [line items] |  |
Securities measured at amortized cost | 38,480 |
Total securities | 108,702 |
Later than one year and not later than five years [member] | Canadian federal government [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | 10,756 |
Securities measured at amortized cost | 2,469 |
Debt securities mandatorily measured and designated at FVTPL | $ 10,040 |
Debt securities measured at FVOCI, yield | 3.20% |
Securities measured at amortized cost, yield | 3.20% |
Later than one year and not later than five years [member] | Other canadian governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 1,757 |
Securities measured at amortized cost | 9,977 |
Debt securities mandatorily measured and designated at FVTPL | $ 1,315 |
Debt securities measured at FVOCI, yield | 2.80% |
Securities measured at amortized cost, yield | 2.70% |
Later than one year and not later than five years [member] | U.S. Treasury and agencies [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 18,385 |
Securities measured at amortized cost | 19,291 |
Debt securities mandatorily measured and designated at FVTPL | $ 6,934 |
Debt securities measured at FVOCI, yield | 3.80% |
Securities measured at amortized cost, yield | 3.30% |
Later than one year and not later than five years [member] | Other foreign governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 3,597 |
Securities measured at amortized cost | 557 |
Debt securities mandatorily measured and designated at FVTPL | $ 810 |
Debt securities measured at FVOCI, yield | 4.20% |
Securities measured at amortized cost, yield | 3.30% |
Later than one year and not later than five years [member] | Mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 2,966 |
Securities measured at amortized cost | 3,106 |
Debt securities mandatorily measured and designated at FVTPL | $ 4,391 |
Debt securities measured at FVOCI, yield | 3.50% |
Securities measured at amortized cost, yield | 2.70% |
Later than one year and not later than five years [member] | Asset backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Securities measured at amortized cost | $ 346 |
Debt securities mandatorily measured and designated at FVTPL | $ 291 |
Securities measured at amortized cost, yield | 4.40% |
Later than one year and not later than five years [member] | Corporate debt [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 6,580 |
Securities measured at amortized cost | 2,734 |
Debt securities mandatorily measured and designated at FVTPL | $ 2,400 |
Debt securities measured at FVOCI, yield | 4.40% |
Securities measured at amortized cost, yield | 3.30% |
Later than one year and not later than five years [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 44,041 |
Debt securities mandatorily measured and designated at FVTPL | 26,181 |
Later than five years and not later than ten years [member] |  |
Disclosure of financial assets [line items] |  |
Securities measured at amortized cost | 12,166 |
Total securities | 39,365 |
Later than five years and not later than ten years [member] | Canadian federal government [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | 1,845 |
Securities measured at amortized cost | 593 |
Debt securities mandatorily measured and designated at FVTPL | $ 3,202 |
Debt securities measured at FVOCI, yield | 3.50% |
Securities measured at amortized cost, yield | 3.50% |
Later than five years and not later than ten years [member] | Other canadian governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 14,009 |
Securities measured at amortized cost | 8,193 |
Debt securities mandatorily measured and designated at FVTPL | $ 1,152 |
Debt securities measured at FVOCI, yield | 3.10% |
Securities measured at amortized cost, yield | 3.50% |
Later than five years and not later than ten years [member] | U.S. Treasury and agencies [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 2,315 |
Securities measured at amortized cost | 1,538 |
Debt securities mandatorily measured and designated at FVTPL | $ 1,530 |
Debt securities measured at FVOCI, yield | 4.20% |
Securities measured at amortized cost, yield | 4.00% |
Later than five years and not later than ten years [member] | Other foreign governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 80 |
Securities measured at amortized cost | 472 |
Debt securities mandatorily measured and designated at FVTPL | $ 48 |
Debt securities measured at FVOCI, yield | 5.50% |
Securities measured at amortized cost, yield | 1.70% |
Later than five years and not later than ten years [member] | Mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 203 |
Securities measured at amortized cost | 639 |
Debt securities mandatorily measured and designated at FVTPL | $ 646 |
Debt securities measured at FVOCI, yield | 2.70% |
Securities measured at amortized cost, yield | 2.40% |
Later than five years and not later than ten years [member] | Asset backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 41 |
Debt securities mandatorily measured and designated at FVTPL | $ 923 |
Debt securities measured at FVOCI, yield | 4.90% |
Later than five years and not later than ten years [member] | Corporate debt [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 499 |
Securities measured at amortized cost | 731 |
Debt securities mandatorily measured and designated at FVTPL | $ 706 |
Debt securities measured at FVOCI, yield | 4.60% |
Securities measured at amortized cost, yield | 4.40% |
Later than five years and not later than ten years [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 18,992 |
Debt securities mandatorily measured and designated at FVTPL | 8,207 |
Later than ten years [member] |  |
Disclosure of financial assets [line items] |  |
Securities measured at amortized cost | 2,635 |
Total securities | 15,673 |
Later than ten years [member] | Canadian federal government [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities mandatorily measured and designated at FVTPL | 1,154 |
Later than ten years [member] | Other canadian governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | 240 |
Securities measured at amortized cost | 266 |
Debt securities mandatorily measured and designated at FVTPL | $ 6,289 |
Debt securities measured at FVOCI, yield | 3.40% |
Securities measured at amortized cost, yield | 3.40% |
Later than ten years [member] | U.S. Treasury and agencies [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities mandatorily measured and designated at FVTPL | $ 3,336 |
Later than ten years [member] | Other foreign governments [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | 3 |
Securities measured at amortized cost | $ 158 |
Debt securities measured at FVOCI, yield | 6.60% |
Securities measured at amortized cost, yield | 2.60% |
Later than ten years [member] | Mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 351 |
Securities measured at amortized cost | $ 347 |
Debt securities measured at FVOCI, yield | 4.50% |
Securities measured at amortized cost, yield | 3.50% |
Later than ten years [member] | Asset backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 390 |
Securities measured at amortized cost | 1,864 |
Debt securities mandatorily measured and designated at FVTPL | $ 484 |
Debt securities measured at FVOCI, yield | 4.80% |
Securities measured at amortized cost, yield | 5.60% |
Later than ten years [member] | Corporate debt [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 16 |
Debt securities mandatorily measured and designated at FVTPL | $ 775 |
Debt securities measured at FVOCI, yield | 4.40% |
Later than ten years [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Debt securities measured at FVOCI | $ 1,000 |
Debt securities mandatorily measured and designated at FVTPL | 12,038 |
With no specific maturity [member] |  |
Disclosure of financial assets [line items] |  |
Corporate equity mandatorily measured at FVTPL and designated at FVOCI | 76,797 |
Total securities | $ 76,797 |

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