Segment Information - Reconciliation of Segment Operating Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Net revenue:
Net revenue	$ 7,764	$ 7,501	$ 22,906	$ 21,211
Earnings before taxes:
Total segment earnings from operations	516	201	1,174	849
Amortization of intangible assets	(72)	(97)	(222)	(235)
Restructuring charges	(2)	(152)	(14)	(304)
Transformation costs	(131)	(31)	(499)	(31)
Acquisition and other related charges	(24)	(56)	(70)	(150)
Separation costs	2	(5)	0	(46)
Interest and other, net	(64)	(87)	(163)	(251)
Tax indemnification adjustments	2	10	(1,342)	(1)
Earnings (loss) from equity interests	11	1	23	(24)
Earnings (loss) from continuing operations before taxes	465	125	(308)	573
Operating Segment
Net revenue:
Net revenue	7,956	7,688	23,443	21,951
Earnings before taxes:
Total segment earnings from operations	801	631	2,195	1,975
Elimination of intersegment net revenue and other
Net revenue:
Net revenue	192	187	537	740
Segment Reconciling Items
Earnings before taxes:
Unallocated corporate costs and eliminations	(44)	(88)	(152)	(308)
Unallocated stock-based compensation expense	(14)	(23)	(64)	(90)
Amortization of intangible assets	(72)	(97)	(222)	(235)
Restructuring charges	(2)	(152)	(14)	(304)
Transformation costs	(131)	(31)	(499)	(31)
Acquisition and other related charges	(24)	(56)	(70)	(150)
Separation costs	2	(5)	0	(46)
Defined benefit plan settlement (charges) and remeasurement benefit	0	22	0	38
Interest and other, net	(64)	(87)	(163)	(251)
Tax indemnification adjustments	2	10	(1,342)	(1)
Earnings (loss) from equity interests	$ 11	$ 1	$ 23	$ (24)