Finance Receivables - Finance Receivables (Details) - USD ($) $ in Millions	Oct. 31, 2018	Oct. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable Due In One Year	$ 1,931
Loans and Leases Receivable, Gross, Carrying Amount, Covered	2,180	$ 1,805
Less: Allowance for Doubtful accounts	22	20
Total finance receivables, net	2,158	1,785
Financing Receivable, Recorded Investment, Current	1,898	1,565
Finance Receivables, Noncurrent	260	220
Loans and Leases Receivable Due In Two Years	133
Loans and Leases Receivable Due In Three Years	94
Loans and Leases Receivable Due In Four Years	57
Loans and Leases Receivable Due In Five Years	18
Loans and Leases Receivable Due Thereafter	4
Finance Receivables Gross	2,237
Loans and Leases Receivable, Gross	2,180
Loans and Leases Receivable, Deferred Income	57
Retail Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable Due In One Year	471
Loans and Leases Receivable, Gross, Carrying Amount, Covered	720	559
Loans and Leases Receivable Due In Two Years	133
Loans and Leases Receivable Due In Three Years	94
Loans and Leases Receivable Due In Four Years	57
Loans and Leases Receivable Due In Five Years	18
Loans and Leases Receivable Due Thereafter	4
Finance Receivables Gross	777
Loans and Leases Receivable, Gross	720
Loans and Leases Receivable, Deferred Income	57
Wholesale Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable Due In One Year	1,460
Loans and Leases Receivable, Gross, Carrying Amount, Covered	1,460	$ 1,246
Loans and Leases Receivable Due In Two Years	0
Loans and Leases Receivable Due In Three Years	0
Loans and Leases Receivable Due In Four Years	0
Loans and Leases Receivable Due In Five Years	0
Loans and Leases Receivable Due Thereafter	0
Finance Receivables Gross	1,460
Loans and Leases Receivable, Gross	1,460
Loans and Leases Receivable, Deferred Income	$ 0