Segment Information - Reconciliation of Segment Operating Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Net revenue:
Net revenue	$ 7,468	$ 6,808	$ 15,142	$ 13,710
Earnings before taxes:
Total segment earnings from operations	397	195	658	648
Amortization of intangible assets	(72)	(72)	(150)	(138)
Restructuring charges	(9)	(69)	(12)	(152)
Transformation costs	(123)	0	(368)	0
Acquisition and other related charges	(16)	(50)	(46)	(94)
Separation costs	(26)	(30)	(2)	(41)
Interest and other, net	(78)	(86)	(99)	(164)
Tax indemnification adjustments	(425)	7	(1,344)	(11)
(Loss) earnings from equity interests	(10)	(3)	12	(25)
(Loss) earnings from continuing operations before taxes	(116)	113	(773)	448
Operating Segment
Net revenue:
Net revenue	7,649	7,115	15,487	14,263
Earnings before taxes:
Total segment earnings from operations	717	552	1,394	1,344
Elimination of intersegment net revenue and other
Net revenue:
Net revenue	181	307	345	553
Segment Reconciling Items
Earnings before taxes:
Unallocated corporate costs and eliminations	(54)	(124)	(108)	(220)
Unallocated stock-based compensation expense	(20)	(24)	(50)	(67)
Amortization of intangible assets	(72)	(72)	(150)	(138)
Restructuring charges	(9)	(69)	(12)	(152)
Transformation costs	(123)	0	(368)	0
Acquisition and other related charges	(16)	(50)	(46)	(94)
Separation costs	(26)	(30)	(2)	(41)
Defined benefit plan settlement charges and remeasurement (benefit)	0	12	0	16
Interest and other, net	(78)	(86)	(99)	(164)
Tax indemnification adjustments	(425)	7	(1,344)	(11)
(Loss) earnings from equity interests	$ (10)	$ (3)	$ 12	$ (25)