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Taxes on Earnings - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Income Tax Disclosure [Abstract]
Effective tax rate (as a percent)	11.90%	73.00%
Net income tax charges (benefits)	$ (16)	$ 428
Pre-Separation tax matters	21	34
Income tax benefit from U.S. tax reform		375
Income tax charges related to future withholding costs on intercompany distributions		37
Income tax benefit on restructuring charges, separation costs, transformation costs and acquisition and other related charges		30
Unrecognized tax benefits	2,200		$ 2,300
Unrecognized tax benefits that would affect effective tax rate if realized	730		772
Interest (income) expense	(5)	$ 25
Accrued income tax for interest and penalties	$ 124		$ 129
Likelihood of no resolution period	12 months
Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months	$ 84
Likelihood of conclusion period for certain federal, foreign and state tax issues	12 months

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Income Tax Benefits Charges, Pre-Separation Tax Matters

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