Allowance for Doubtful Accounts - Schedule of Allowance for Retail, Wholesale, Trade & Other (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	$ 50	$ 49	$ 48	$ 49
Provision for doubtful accounts, net of recoveries	2	1	3	7
Charge-off of accounts	(2)	(1)	(3)	(5)
Allowance for Doubtful Accounts Receivable, Recoveries		0		0
Financing Receivable, Allowance for Credit Losses, Other	(2)	2	(1)	0
Allowance for doubtful accounts at end of period	49	51	49	51
Allowance for Doubtful Accounts [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for Doubtful Accounts Receivable, Recoveries	1		2
Retail Portfolio [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	18	19	17	19
Provision for doubtful accounts, net of recoveries	3	1	3	6
Charge-off of accounts	(2)	(1)	(3)	(4)
Financing Receivable, Allowance for Credit Losses, Other	(1)	2	0	0
Allowance for doubtful accounts at end of period	19	21	19	21
Impaired Financing Receivable, Average Recorded Investment			18	17
Wholesale Portfolio [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	3	2	3	2
Provision for doubtful accounts, net of recoveries	0	0	0	0
Charge-off of accounts	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Other	0	0	0	0
Allowance for doubtful accounts at end of period	3	2	3	2
Trade and Other Receivables [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period	29	28	28	28
Provision for doubtful accounts, net of recoveries	(1)	0	0	1
Charge-off of accounts	0	0	0	(1)
Financing Receivable, Allowance for Credit Losses, Other	(1)	0	(1)	0
Allowance for doubtful accounts at end of period	27	$ 28	27	$ 28
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	$ 1		$ 2