Balance Sheet Details (Detail) - USD ($) $ in Millions		12 Months Ended
		Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2017	Oct. 31, 2016
Accounts Receivable, Net
Unbilled receivable					$ 223	$ 150
Accounts receivable					2,892	3,050
Allowance for doubtful accounts		$ (49)	$ (72)	$ (70)	(42)	(49)
Accounts receivable, net					3,073	3,151
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year		49	72	70
Provision for doubtful accounts		16	22	6
Deductions, net of recoveries		(23)	(45)	(4)
Balance at end of year		42	49	72
Trade receivables sold and cash received
Balance at beginning of period		145	68	188
Trade receivables sold		3,910	3,015	4,221
Cash receipts		(3,937)	(2,931)	(4,327)
Foreign currency and other		3	(7)	(14)
Balance at end of period		$ 121	$ 145	$ 68
Inventory
Finished goods					1,236	1,170
Purchased parts and fabricated assemblies					1,079	550
Inventory, net					2,315	1,720
Other Current Assets
Value-added taxes receivable					819	741
Manufacturer and other receivables					1,185	1,007
Prepaid and other current assets					1,081	946
Other current assets, total					3,085	2,694
Long-Term Financing Receivables and Other Assets
Financing receivables, net					4,380	4,584
Deferred tax assets—long-term					4,663	2,806
Deferred costs—long-term					830	366
Other					2,727	2,720
Long-Term Financing Receivables and Other Assets, total	[1]				12,600	10,476
Other Accrued Liabilities
Accrued taxes—other					929	801
Warranty					269	258
Sales and marketing programs					780	837
Other					1,866	1,821
Other Accrued Liabilities, total					3,844	3,717
Other Liabilities
Pension, post-retirement, and post-employment liabilities					1,413	2,101
Deferred revenue—long-term					2,487	2,330
Tax liability—long-term					3,859	3,641
Other long-term liabilities					1,036	802
Other Liabilities, total					$ 8,795	$ 8,874

[1] During the first quarter of fiscal 2017, the Company adopted ASU 2015-03, which simplifies the presentation of debt issuance costs by requiring debt issuance costs to be presented as a deduction from the corresponding debt liability rather than an asset that is amortized. The Company adopted the standard retrospectively for the prior period presented.