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Segment Information - Reconciliation of Segment Operating Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Net revenue:
Net revenue	$ 6,700	$ 6,009	$ 13,533	$ 12,958
(Loss) earnings before taxes:
Total segment earnings from operations	278	(834)	500	(486)
Amortization of intangible assets	(84)	(84)	(194)	(204)
Transformation costs	(209)	(200)	(520)	(289)
Acquisition, disposition and other related charges	(13)	(18)	(31)	(40)
Interest and other, net	(11)	(68)	(55)	(87)
Tax indemnification adjustments	0	(35)	(16)	(56)
Non-service net periodic benefit credit	17	36	34	73
Earnings (loss) from equity interests	4	(10)	30	23
Earnings (loss) before taxes	288	(911)	493	(533)
Operating Segment
Net revenue:
Net revenue	6,786	6,174	13,714	13,201
(Loss) earnings before taxes:
Total segment earnings from operations	735	480	1,560	1,227
Elimination of intersegment net revenue and other
Net revenue:
Net revenue	(86)	(165)	(181)	(243)
Segment Reconciling Items
(Loss) earnings before taxes:
Unallocated corporate costs and eliminations	(50)	(48)	(102)	(100)
Stock-based compensation expense	(98)	(67)	(208)	(160)
Amortization of initial direct costs	(2)	(3)	(4)	(6)
Amortization of intangible assets	(84)	(84)	(194)	(204)
Transformation costs	(209)	(200)	(520)	(289)
Disaster charges	(1)	(22)	(1)	(22)
Acquisition, disposition and other related charges	(13)	(25)	(31)	(67)
Impairment of goodwill	0	(865)	0	(865)
Interest and other, net	(11)	(68)	(55)	(87)
Tax indemnification adjustments	0	(35)	(16)	(56)
Non-service net periodic benefit credit	17	36	34	73
Earnings (loss) from equity interests	$ 4	$ (10)	$ 30	$ 23

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