Allowance for Credit Losses - Schedule of Allowance for Retail, Wholesale, Trade & Other (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Oct. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period		$ 46	$ 44	$ 44
Provision for credit losses/doubtful accounts	$ 3	5	6	9
Charge-offs	(3)	(1)	(5)	(3)
Recoveries	1		1
Other	0	(7)	2	(7)
Allowance for credit losses at end of period	48	43	48	43
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period			(8)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period			8
Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period		47	44
Retail portfolio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period		22	23	20
Provision for credit losses/doubtful accounts	2	4	5	7
Charge-offs	(3)	(1)	(5)	(3)
Recoveries	1		1
Other	(1)	(4)	1	(3)
Allowance for credit losses at end of period	32	21	32	21
Retail portfolio | Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period			0
Retail portfolio | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period			7
Retail portfolio | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period		33	30
Wholesale portfolio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period		3	2	3
Provision for credit losses/doubtful accounts	0	(1)	0	(1)
Charge-offs	0	0	0	0
Recoveries	0		0
Other	0	0	0	0
Allowance for credit losses at end of period	2	2	2	2
Wholesale portfolio | Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period			0
Wholesale portfolio | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period			0
Wholesale portfolio | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period		2	2
Trade and Other Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period		21	19	21
Provision for credit losses/doubtful accounts	1	2	1	3
Charge-offs	0	0	0	0
Recoveries	0		0
Other	1	(3)	1	(4)
Allowance for credit losses at end of period	$ 14	20	14	$ 20
Financing receivable, non-credit reserves					$ 8
Trade and Other Receivables | Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period			(8)
Trade and Other Receivables | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period			1
Trade and Other Receivables | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts at beginning of period		$ 12	$ 12