Securities (Summary of Unrealized Gains and Losses) (Details) - CAD ($) $ in Millions	Jul. 31, 2026	Oct. 31, 2025
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Fair value	$ 135,092	$ 126,369
Securities [Member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	134,071	125,518
Gross unrealized gains	1,095	864
Gross unrealized (losses)	(448)	(301)
Fair value	134,718	126,081
Securities [Member] \| Debt securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	130,540	122,663
Gross unrealized gains	751	571
Gross unrealized (losses)	(337)	(200)
Fair value	130,954	123,034
Securities [Member] \| Government and government-related securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	106,768	100,939
Gross unrealized gains	642	454
Gross unrealized (losses)	(294)	(159)
Fair value	107,116	101,234
Securities [Member] \| Government and government-related securities [member] \| Canadian government federal debt [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	16,468	15,956
Gross unrealized gains	65	23
Gross unrealized (losses)	(55)	(88)
Fair value	16,478	15,891
Securities [Member] \| Government and government-related securities [member] \| Canadian government provincial debt [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	24,761	20,971
Gross unrealized gains	211	120
Gross unrealized (losses)	(41)	(11)
Fair value	24,931	21,080
Securities [Member] \| Government and government-related securities [member] \| U.S. federal, state, municipal governments, and agencies debt [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	54,137	54,279
Gross unrealized gains	318	267
Gross unrealized (losses)	(185)	(54)
Fair value	54,270	54,492
Securities [Member] \| Government and government-related securities [member] \| Other OECD government-guaranteed debt [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	9,763	7,864
Gross unrealized gains	40	15
Gross unrealized (losses)	(12)	(4)
Fair value	9,791	7,875
Securities [Member] \| Government and government-related securities [member] \| Mortgage-backed securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	1,639	1,869
Gross unrealized gains	8	29
Gross unrealized (losses)	(1)	(2)
Fair value	1,646	1,896
Securities [Member] \| Other debt securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	23,772	21,724
Gross unrealized gains	109	117
Gross unrealized (losses)	(43)	(41)
Fair value	23,838	21,800
Securities [Member] \| Other debt securities [member] \| Asset-backed financings [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	8,350	8,713
Gross unrealized gains	33	11
Gross unrealized (losses)	(9)	(15)
Fair value	8,374	8,709
Securities [Member] \| Other debt securities [member] \| Corporate and other debt [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	15,422	13,011
Gross unrealized gains	76	106
Gross unrealized (losses)	(34)	(26)
Fair value	15,464	13,091
Securities [Member] \| Equity Securities [Member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	3,531	2,855
Gross unrealized gains	344	293
Gross unrealized (losses)	(111)	(101)
Fair value	3,764	3,047
Securities [Member] \| Equity Securities [Member] \| Common shares [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	2,761	2,332
Gross unrealized gains	246	226
Gross unrealized (losses)	(32)	(22)
Fair value	2,975	2,536
Securities [Member] \| Equity Securities [Member] \| Preference shares [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	770	523
Gross unrealized gains	98	67
Gross unrealized (losses)	(79)	(79)
Fair value	$ 789	$ 511

The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

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