Balance Sheet Details (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2018	Oct. 31, 2017
Accounts Receivable, Net
Unbilled receivable				$ 185	$ 223
Accounts receivable				3,117	2,892
Allowance for doubtful accounts	$ (42)	$ (49)	$ (72)	(39)	(42)
Accounts receivable, net				3,263	3,073
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	42	49	72
Provision for doubtful accounts	20	16	22
Deductions, net of recoveries	(23)	(23)	(45)
Balance at end of year	39	42	49
Trade receivables sold and cash received
Balance at beginning of period	121	145	68
Trade receivables sold	4,844	3,910	3,015
Cash receipts	(4,794)	(3,937)	(2,931)
Foreign currency and other	(5)	3	(7)
Balance at end of period	$ 166	$ 121	$ 145
Inventory
Finished goods				1,274	1,236
Purchased parts and fabricated assemblies				1,173	1,079
Inventory, net				2,447	2,315
Other Current Assets
Value-added taxes receivable				811	819
Manufacturer and other receivables				1,141	1,185
Prepaid and other current assets				1,328	1,081
Other current assets, total				3,280	3,085
Other Accrued Liabilities
Accrued taxes - other				1,010	929
Warranty - short-term				241	269
Sales and marketing programs				910	780
Other				1,679	1,866
Total				3,840	3,844
Other Liabilities
Pension, post-retirement, and post-employment liabilities				1,434	1,413
Deferred revenue - long-term				2,646	2,487
Tax liability - long-term				1,485	3,859
Other long-term liabilities				1,320	1,036
Other Liabilities, total				6,885	8,795
Long-Term Financing Receivables and Other Assets
Financing receivables, net				4,740	4,380
Deferred tax assets				2,403	4,663
Prepaid taxes - long-term				2,340	293
Prepaid pension assets				829	830
Other				1,031	1,004
Total				11,359	12,600
Tax Indemnification
Long-Term Financing Receivables and Other Assets
Indemnification receivable - long-term				$ 16	$ 1,430