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Taxes on Earnings - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Oct. 31, 2020
Income Tax Examination [Line Items]
Effective tax rate (as a percent)	10.10%	9.90%	2.20%	8.40%
Net income tax benefits	$ 33	$ 151	$ 124	$ 167
Income tax benefit on restructuring charges, separation costs, transformation costs and acquisition and other related charges	41	48	107	48
Tax rate changes			30
Pre-Separation tax matters		35		56
Unrecognized tax benefits	2,100		2,100		$ 2,200
Unrecognized tax benefits that would affect effective tax rate if realized	704		704		731
Accrued income tax for interest and penalties	122		$ 122		$ 119
Likelihood of no resolution period			12 months
Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months	$ 50		$ 50
Foreign Tax Authority | India
Income Tax Examination [Line Items]
Tax rate changes		$ 57		$ 57

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