Allowance for Doubtful Accounts - Schedule of Allowance Aging Analysis (Details) - USD ($) $ in Millions	Jul. 31, 2020	Oct. 31, 2019
Financing Receivable, Past Due [Line Items]
Finance Receivables, Current	$ 1,612	$ 2,118
30-90 days past due	43	77
Total finance receivables	1,678	2,220
Retail Portfolio [Member]
Financing Receivable, Past Due [Line Items]
Finance Receivables, Current	485	753
30-90 days past due	42	76
Total finance receivables	550	854
Wholesale Portfolio [Member]
Financing Receivable, Past Due [Line Items]
Finance Receivables, Current	1,127	1,365
30-90 days past due	1	1
Total finance receivables	1,128	1,366
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Over 90 days past due	23	25
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Retail Portfolio [Member]
Financing Receivable, Past Due [Line Items]
Over 90 days past due	23	25
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Wholesale Portfolio [Member]
Financing Receivable, Past Due [Line Items]
Over 90 days past due	$ 0	$ 0