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Accounting for Leases as a Lessor - Operating Lease Assets Included in Machinery and Equipment (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Leases [Abstract]    
Equipment leased to customers   $ 7,185
Accumulated depreciation   (3,101)
Total   4,084
Lessor, Lease, Description [Line Items]    
Equipment leased to customers $ 11,530 11,901
Accumulated depreciation (5,819) (5,847)
Total 5,711 $ 6,054
Equipment Leased to Customers    
Lessor, Lease, Description [Line Items]    
Equipment leased to customers 7,097  
Accumulated depreciation (3,117)  
Total $ 3,980