Allowance for Doubtful Accounts - Schedule of Allowance for Retail, Wholesale, Trade & Other (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	$ 46	$ 51	$ 44	$ 50
Provision for Loan, Lease, and Other Losses	5	5	9	6
Financing Receivable, Allowance for Credit Losses, Write-downs	(1)	(2)	(3)	(3)
Financing Receivable, Allowance for Credit Losses, Other	(7)	0	(7)	1
Allowance for doubtful accounts at end of period	43	54	43	54
Retail Portfolio [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	22	20	20	19
Provision for Loan, Lease, and Other Losses	4	3	7	4
Financing Receivable, Allowance for Credit Losses, Write-downs	(1)	(1)	(3)	(2)
Financing Receivable, Allowance for Credit Losses, Other	(4)	0	(3)	1
Allowance for doubtful accounts at end of period	21	22	21	22
Impaired Financing Receivable, Average Recorded Investment			23	21
Wholesale Portfolio [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	3	3	3	3
Provision for Loan, Lease, and Other Losses	(1)	0	(1)	0
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Other	0	0	0	0
Allowance for doubtful accounts at end of period	2	3	2	3
Trade and Other Receivables [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	21	28	21	28
Provision for Loan, Lease, and Other Losses	2	2	3	2
Financing Receivable, Allowance for Credit Losses, Write-downs	0	(1)	0	(1)
Financing Receivable, Allowance for Credit Losses, Other	(3)	0	(4)	0
Allowance for doubtful accounts at end of period	$ 20	$ 29	$ 20	$ 29