Allowance for Doubtful Accounts - Schedule of Allowance for Retail, Wholesale, Trade & Other (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Loan, Lease, and Other Losses	$ (5)	$ (2)	$ (6)	$ (3)
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	51	50	50	48
Allowance for doubtful accounts at end of period	54	49	54	49
Financing Receivable, Allowance for Credit Losses, Write-downs	(2)	(2)	(3)	(3)
Allowance for Doubtful Accounts Receivable, Recoveries		1		2
Financing Receivable, Allowance for Credit Losses, Other	0	(2)	1	(1)
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for Doubtful Accounts Receivable, Recoveries	0		0
Retail Portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Loan, Lease, and Other Losses	(3)	(3)	(4)	(3)
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	20	18	19	17
Allowance for doubtful accounts at end of period	22	19	22	19
Impaired Financing Receivable, Average Recorded Investment			21	18
Financing Receivable, Allowance for Credit Losses, Write-downs	(1)	(2)	(2)	(3)
Allowance for Doubtful Accounts Receivable, Recoveries		1		2
Financing Receivable, Allowance for Credit Losses, Other	0	(1)	1	0
Wholesale Portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Loan, Lease, and Other Losses	0	0	0	0
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	3	3	3	3
Allowance for doubtful accounts at end of period	3	3	3	3
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0	0	0
Allowance for Doubtful Accounts Receivable, Recoveries		0		0
Financing Receivable, Allowance for Credit Losses, Other	0	0	0	0
Trade and Other Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Loan, Lease, and Other Losses	(2)	(1)	(2)	0
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	28	29	28	28
Allowance for doubtful accounts at end of period	29	27	29	27
Financing Receivable, Allowance for Credit Losses, Write-downs	(1)	0	(1)	0
Allowance for Doubtful Accounts Receivable, Recoveries		0		0
Financing Receivable, Allowance for Credit Losses, Other	0	$ (1)	0	$ (1)
Trade and Other Receivables [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for Doubtful Accounts Receivable, Recoveries	0		0
Wholesale Portfolio [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for Doubtful Accounts Receivable, Recoveries	0		0
Retail Portfolio [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for Doubtful Accounts Receivable, Recoveries	$ 0		$ 0