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Accounting for Leases as a Lessee - Additional Lease Information (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Operating Leases
Weighted-average remaining lease term (in years)	7 years 8 months 12 days	6 years 9 months 18 days
Weighted-average discount rate	2.70%	2.60%
Finance Leases
Weighted-average remaining lease term (in years)	8 years 6 months	9 years 6 months
Weighted-average discount rate	3.50%	3.50%
Cash Flow Statement Activity
Cash outflows from operating leases	$ 220	$ 239
ROU assets obtained in exchange for new operating lease liabilities	$ 248	$ 298

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