Securities (Summary of Unrealized Gains and Losses) (Details) - CAD ($) $ in Millions	Apr. 30, 2026	Oct. 31, 2025
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Fair value	$ 128,612	$ 126,369
Securities [Member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	127,566	125,518
Gross unrealized gains	961	864
Gross unrealized (losses)	(308)	(301)
Fair value	128,219	126,081
Securities [Member] \| Debt securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	124,460	122,663
Gross unrealized gains	623	571
Gross unrealized (losses)	(199)	(200)
Fair value	124,884	123,034
Securities [Member] \| Government and government-related securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	102,424	100,939
Gross unrealized gains	525	454
Gross unrealized (losses)	(157)	(159)
Fair value	102,792	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	17,159	15,956
Gross unrealized gains	42	23
Gross unrealized (losses)	(62)	(88)
Fair value	17,139	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	20,849	20,971
Gross unrealized gains	168	120
Gross unrealized (losses)	(4)	(11)
Fair value	21,013	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	54,282	54,279
Gross unrealized gains	272	267
Gross unrealized (losses)	(89)	(54)
Fair value	54,465	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	8,311	7,864
Gross unrealized gains	25	15
Gross unrealized (losses)	(1)	(4)
Fair value	8,335	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	1,823	1,869
Gross unrealized gains	18	29
Gross unrealized (losses)	(1)	(2)
Fair value	1,840	1,896
Securities [Member] \| Other debt securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	22,036	21,724
Gross unrealized gains	98	117
Gross unrealized (losses)	(42)	(41)
Fair value	22,092	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	8,316	8,713
Gross unrealized gains	22	11
Gross unrealized (losses)	(11)	(15)
Fair value	8,327	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	13,720	13,011
Gross unrealized gains	76	106
Gross unrealized (losses)	(31)	(26)
Fair value	13,765	13,091
Securities [Member] \| Equity Securities [Member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	3,106	2,855
Gross unrealized gains	338	293
Gross unrealized (losses)	(109)	(101)
Fair value	3,335	3,047
Securities [Member] \| Equity Securities [Member] \| Common shares [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	2,401	2,332
Gross unrealized gains	253	226
Gross unrealized (losses)	(30)	(22)
Fair value	2,624	2,536
Securities [Member] \| Equity Securities [Member] \| Preference shares [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	705	523
Gross unrealized gains	85	67
Gross unrealized (losses)	(79)	(79)
Fair value	$ 711	$ 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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