Balance Sheet Details (Details) - USD ($) $ in Millions	6 Months Ended
	Apr. 30, 2017	Apr. 30, 2017	Oct. 31, 2016
Accounts Receivable, Net
Accounts receivable, billed		$ 3,585	$ 3,681
Unbilled receivable		267	191
Accounts receivable, gross		3,852	3,872
Allowance for doubtful accounts	$ (56)	(42)	(56)
Total		3,810	3,816
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	56
Deductions, net of recoveries	(14)
Balance at end of period	42
Trade receivables sold and cash received
Balance at beginning of period	145
Trade receivables sold	1,541
Cash receipts	(1,624)
Foreign currency and other	(1)
Balance at end of period	$ 61
Inventory, Net [Abstract]
Finished goods		1,218	1,182
Purchased parts and fabricated assemblies		823	558
Inventory [Line Items]
Total		2,041	$ 1,740
SGI
Inventory [Line Items]
Total		$ 118