Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Jul. 31, 2017	Oct. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 6,340	$ 5,762
Amortizable intangible assets, accumulated amortization	(1,826)	(1,575)
Finite-lived intangible assets, accumulated impairment losses	(3,103)	(3,103)
Amortizable intangible assets, net	1,327
Total intangible assets, net	1,411	1,084
In-process research and development
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross and net	84	0
Customer contracts, customer lists and distribution agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	1,487	1,394
Amortizable intangible assets, accumulated amortization	(334)	(322)
Finite-lived intangible assets, accumulated impairment losses	(856)	(856)
Amortizable intangible assets, net	297	216
Developed and core technology and patents
Acquired Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	4,555	4,190
Amortizable intangible assets, accumulated amortization	(1,460)	(1,232)
Finite-lived intangible assets, accumulated impairment losses	(2,138)	(2,138)
Amortizable intangible assets, net	957	820
Trade name and trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	214	178
Amortizable intangible assets, accumulated amortization	(32)	(21)
Finite-lived intangible assets, accumulated impairment losses	(109)	(109)
Amortizable intangible assets, net	$ 73	$ 48