Securities (Summary of Unrealized Gains and Losses) (Details) - CAD ($) $ in Millions	Apr. 30, 2024	Oct. 31, 2023
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Fair value	$ 75,246	$ 69,865
Securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	75,297	70,231
Gross unrealized gains	484	307
Gross unrealized (losses)	(741)	(1,094)
Fair value	75,040	69,444
Securities [member] \| Debt securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	71,602	66,474
Gross unrealized gains	227	211
Gross unrealized (losses)	(485)	(754)
Fair value	71,344	65,931
Securities [member] \| Government and government-related securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	58,956	53,382
Gross unrealized gains	167	168
Gross unrealized (losses)	(412)	(623)
Fair value	58,711	52,927
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	18,693	18,335
Gross unrealized gains	39	45
Gross unrealized (losses)	(125)	(170)
Fair value	18,607	18,210
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	20,540	19,953
Gross unrealized gains	95	105
Gross unrealized (losses)	(49)	(118)
Fair value	20,586	19,940
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	15,791	11,260
Gross unrealized gains	30	17
Gross unrealized (losses)	(197)	(275)
Fair value	15,624	11,002
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	1,698	1,521
Gross unrealized gains	2	1
Gross unrealized (losses)	(17)	(24)
Fair value	1,683	1,498
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	2,234	2,313
Gross unrealized gains	1	0
Gross unrealized (losses)	(24)	(36)
Fair value	2,211	2,277
Securities [member] \| Other debt securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	12,646	13,092
Gross unrealized gains	60	43
Gross unrealized (losses)	(73)	(131)
Fair value	12,633	13,004
Securities [member] \| Other debt securities [member] \| Asset-backed financings [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	3,473	4,146
Gross unrealized gains	1	0
Gross unrealized (losses)	(16)	(32)
Fair value	3,458	4,114
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	9,173	8,946
Gross unrealized gains	59	43
Gross unrealized (losses)	(57)	(99)
Fair value	9,175	8,890
Securities [member] \| Equity securities [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	3,695	3,757
Gross unrealized gains	257	96
Gross unrealized (losses)	(256)	(340)
Fair value	3,696	3,513
Securities [member] \| Equity securities [member] \| Common shares [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	3,075	3,191
Gross unrealized gains	237	95
Gross unrealized (losses)	(88)	(116)
Fair value	3,224	3,170
Securities [member] \| Equity securities [member] \| Preference shares [member]
Disclosure Of Unrealized Gains Losses For Securities At FVOCI [Line Items]
Cost/amortized cost	620	566
Gross unrealized gains	20	1
Gross unrealized (losses)	(168)	(224)
Fair value	$ 472	$ 343

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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