Taxes on Earnings - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Oct. 31, 2019
Income Tax Examination [Line Items]
Effective tax rate (as a percent)	9.90%	4.80%	8.40%	45.60%
Net income tax charges (benefits)	$ (151)	$ (45)	$ (167)	$ 383
Income tax benefit on restructuring charges, separation costs, transformation costs and acquisition and other related charges	48	27	48	57
Pre-Separation tax matters	35	10	(56)	(44)
Income tax (benefit) charges from U.S. tax reform		(24)		351
Income tax charges related to future withholding costs on intercompany distributions				40
Unrecognized tax benefits	2,200		2,200		$ 2,300
Unrecognized tax benefits that would affect effective tax rate if realized	705		705		772
Interest (income) expense	(20)	$ 6	(25)	$ 31
Accrued income tax for interest and penalties	104		$ 104		$ 129
Likelihood of no resolution period			12 months
Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months	77		$ 77
Likelihood of conclusion period for certain federal, foreign and state tax issues			12 months
Foreign Tax Authority \| India
Income Tax Examination [Line Items]
Distribution tax rate changes	$ 57		$ 57

Income Tax Benefits Charges, Pre-Separation Tax Matters

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The period of likelihood that the certain tax position pertaining to federal, foreign and state tax issues will be concluded.

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The period of likelihood that the uncertain tax position will not be resolved.

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This represents income tax charges (benefits) and includes restructuring, separation, and other related cost.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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