Accounting for Leases as a Lessor - Operating Lease Assets Included in Machinery and Equipment (Details) - USD ($) $ in Millions	Jul. 31, 2021	Oct. 31, 2020
Leases [Abstract]
Equipment leased to customers	$ 7,166	$ 7,184
Accumulated depreciation	(3,223)	(3,157)
Total	$ 3,943	$ 4,027

Amount of accumulated depreciation of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

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