Fair Value Measurements - Summary of Changes in Level 3 Instruments Carried at Fair Value (Details) - Level 3 - CAD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Jul. 31, 2026 |
Jul. 31, 2025 |
Jul. 31, 2026 |
Jul. 31, 2025 |
| Other assets |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
$ 1,495
|
$ 1,435
|
$ 1,483
|
$ 1,717
|
| Change in fair value included in earnings |
(21)
|
0
|
(18)
|
(56)
|
| Change in fair value included in other comprehensive income |
2
|
0
|
0
|
0
|
| Purchases/Issuances |
8
|
13
|
54
|
214
|
| Sales |
0
|
0
|
(10)
|
(7)
|
| Maturities/Settlement |
(24)
|
(15)
|
(49)
|
(435)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Assets at end of period |
1,460
|
1,433
|
1,460
|
1,433
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
(21)
|
0
|
(18)
|
(52)
|
| Derivative Assets |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
26
|
24
|
25
|
12
|
| Change in fair value included in earnings |
(14)
|
(5)
|
(11)
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
16
|
0
|
48
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
(1)
|
0
|
(43)
|
| Transfers into Level 3 |
0
|
0
|
4
|
17
|
| Transfers out of Level 3 |
(5)
|
0
|
(11)
|
0
|
| Assets at end of period |
7
|
34
|
7
|
34
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
(14)
|
(5)
|
(11)
|
0
|
| Foreign exchange contracts | Derivative Assets |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
19
|
0
|
2
|
10
|
| Change in fair value included in earnings |
(15)
|
0
|
2
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
16
|
0
|
48
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
(42)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Assets at end of period |
4
|
16
|
4
|
16
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
(15)
|
0
|
2
|
0
|
| Commodity contracts | Derivative Assets |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
0
|
9
|
13
|
2
|
| Change in fair value included in earnings |
1
|
(7)
|
(12)
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Assets at end of period |
1
|
2
|
1
|
2
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
1
|
(7)
|
(12)
|
0
|
| Equity contracts | Derivative Assets |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
7
|
14
|
10
|
0
|
| Change in fair value included in earnings |
0
|
2
|
(1)
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
4
|
16
|
| Transfers out of Level 3 |
(5)
|
0
|
(11)
|
0
|
| Assets at end of period |
2
|
16
|
2
|
16
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
0
|
2
|
(1)
|
0
|
| Credit default swaps | Derivative Assets |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
0
|
1
|
0
|
0
|
| Change in fair value included in earnings |
0
|
0
|
0
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
(1)
|
0
|
(1)
|
| Transfers into Level 3 |
0
|
0
|
0
|
1
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Assets at end of period |
0
|
0
|
0
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
0
|
0
|
0
|
0
|
| Other Liabilities |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Liabilities at beginning of period |
135
|
0
|
0
|
0
|
| Change in fair value included in earnings |
63
|
0
|
86
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
112
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Liabilities at end of period |
198
|
0
|
198
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
63
|
0
|
86
|
0
|
| Derivative Liabilities |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Liabilities at beginning of period |
21
|
1
|
5
|
7
|
| Change in fair value included in earnings |
17
|
0
|
33
|
(4)
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
(1)
|
| Transfers into Level 3 |
0
|
0
|
5
|
1
|
| Transfers out of Level 3 |
(5)
|
(1)
|
(10)
|
(3)
|
| Liabilities at end of period |
33
|
0
|
33
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
17
|
0
|
33
|
(4)
|
| Derivative Liabilities | Foreign exchange contracts |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Liabilities at beginning of period |
8
|
0
|
0
|
0
|
| Change in fair value included in earnings |
19
|
0
|
27
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Liabilities at end of period |
27
|
0
|
27
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
19
|
0
|
27
|
0
|
| Derivative Liabilities | Commodity contracts |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Liabilities at beginning of period |
8
|
0
|
0
|
4
|
| Change in fair value included in earnings |
(4)
|
0
|
4
|
(4)
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Liabilities at end of period |
4
|
0
|
4
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
(4)
|
0
|
4
|
(4)
|
| Derivative Liabilities | Equity contracts |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Liabilities at beginning of period |
5
|
1
|
5
|
2
|
| Change in fair value included in earnings |
1
|
0
|
1
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
5
|
1
|
| Transfers out of Level 3 |
(5)
|
(1)
|
(10)
|
(3)
|
| Liabilities at end of period |
1
|
0
|
1
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
1
|
0
|
1
|
0
|
| Derivative Liabilities | Credit default swaps |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Liabilities at beginning of period |
0
|
0
|
0
|
1
|
| Change in fair value included in earnings |
1
|
0
|
1
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
(1)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Liabilities at end of period |
1
|
0
|
1
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
1
|
0
|
1
|
0
|
| Corporate equity |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at end of period |
6,364
|
|
6,364
|
|
| Trading Securities |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
0
|
5
|
0
|
4
|
| Change in fair value included in earnings |
0
|
0
|
0
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
7
|
| Sales |
0
|
(5)
|
0
|
(5)
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
(6)
|
| Assets at end of period |
0
|
0
|
0
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
0
|
0
|
0
|
0
|
| Trading Securities | NHA MBS, U.S. agency MBS and CMO |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
0
|
5
|
0
|
0
|
| Change in fair value included in earnings |
0
|
0
|
0
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
5
|
| Sales |
0
|
(5)
|
0
|
(5)
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Assets at end of period |
0
|
0
|
0
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
0
|
0
|
0
|
0
|
| Trading Securities | Corporate equity |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
0
|
0
|
0
|
4
|
| Change in fair value included in earnings |
0
|
0
|
0
|
0
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
0
|
2
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
(6)
|
| Assets at end of period |
0
|
0
|
0
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
0
|
0
|
0
|
0
|
| FVTPL Securities |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
5,821
|
5,293
|
5,824
|
4,934
|
| Change in fair value included in earnings |
37
|
(25)
|
(130)
|
(120)
|
| Change in fair value included in other comprehensive income |
78
|
10
|
3
|
(11)
|
| Purchases/Issuances |
389
|
288
|
923
|
904
|
| Sales |
(140)
|
(55)
|
(504)
|
(194)
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
73
|
0
|
| Transfers out of Level 3 |
(2)
|
(42)
|
(6)
|
(44)
|
| Assets at end of period |
6,183
|
5,469
|
6,183
|
5,469
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
94
|
20
|
42
|
37
|
| FVTPL Securities | Corporate equity |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
5,818
|
5,257
|
5,824
|
4,899
|
| Change in fair value included in earnings |
28
|
(25)
|
(139)
|
(121)
|
| Change in fair value included in other comprehensive income |
78
|
10
|
3
|
(11)
|
| Purchases/Issuances |
389
|
288
|
920
|
902
|
| Sales |
(140)
|
(55)
|
(504)
|
(194)
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
73
|
0
|
| Transfers out of Level 3 |
(2)
|
(6)
|
(6)
|
(6)
|
| Assets at end of period |
6,171
|
5,469
|
6,171
|
5,469
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
85
|
20
|
33
|
36
|
| FVTPL Securities | Corporate debt |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
3
|
36
|
0
|
35
|
| Change in fair value included in earnings |
9
|
0
|
9
|
1
|
| Change in fair value included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases/Issuances |
0
|
0
|
3
|
2
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
(36)
|
0
|
(38)
|
| Assets at end of period |
12
|
0
|
12
|
0
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
9
|
0
|
9
|
1
|
| FVOCI securities |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
189
|
189
|
192
|
177
|
| Change in fair value included in earnings |
0
|
0
|
0
|
0
|
| Change in fair value included in other comprehensive income |
4
|
0
|
0
|
(15)
|
| Purchases/Issuances |
0
|
1
|
1
|
28
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Assets at end of period |
193
|
190
|
193
|
190
|
| FVOCI securities | Corporate equity |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
189
|
189
|
192
|
177
|
| Change in fair value included in earnings |
0
|
0
|
0
|
0
|
| Change in fair value included in other comprehensive income |
4
|
0
|
0
|
(15)
|
| Purchases/Issuances |
0
|
1
|
1
|
28
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Assets at end of period |
193
|
190
|
193
|
190
|
| Loans: Business and government |
|
|
|
|
| Disclosure of fair value measurement of assets [line items] |
|
|
|
|
| Assets at beginning of period |
314
|
382
|
324
|
302
|
| Change in fair value included in earnings |
1
|
(17)
|
4
|
(15)
|
| Change in fair value included in other comprehensive income |
10
|
0
|
(26)
|
(1)
|
| Purchases/Issuances |
0
|
0
|
23
|
56
|
| Sales |
0
|
0
|
0
|
0
|
| Maturities/Settlement |
(15)
|
(46)
|
(15)
|
(52)
|
| Transfers into Level 3 |
0
|
0
|
0
|
29
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Assets at end of period |
310
|
319
|
310
|
319
|
| Change in unrealized gains (losses) recorded in income for instruments still held |
$ 1
|
$ (17)
|
$ 4
|
$ (15)
|