Effective Income Tax Rate Reconciliation, 2017 Tax Cut and Jobs Act, Transition Tax, Adjustment Amount

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Taxes on Earnings (Details 3) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2019	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Income Tax Examination [Line Items]
Tax charges related to changes in valuation allowances as a result of the Tax Act			$ 422
Income tax charges related to future withholding costs on intercompany distributions		$ 40
Income tax charges related to future withholding tax costs	$ 37
Income tax benefits related to pre-Separation tax liabilities		274	208	$ 88
Income tax benefits from transformation costs, acquisition, disposition and other related charges		104	125	326
Income tax charges (benefits) related to items unique to the year		152	(2,000)	(554)
Provision for (benefit from) taxes on earnings		504	(1,744)	(164)
Share-based compensation cost			65
Valuation allowance on deferred tax assets		8,225	8,209
Income tax benefits related to tax indemnification				699
Income tax benefits, reduced rates for subsidiaries in certain countries		$ 837	$ 792	$ 378
Income tax benefits, reduced rates for subsidiaries in certain countries (in dollars per share)		$ 0.61	$ 0.51	$ 0.23
U.S. federal statutory income tax rate		21.00%	23.30%	35.00%
Additional tax charge	426
Additional Transition Tax adjustment	7
Spinoff \| Everett SpinCo, Inc. and Seattle SpinCo, Inc.
Income Tax Examination [Line Items]
Provision for (benefit from) taxes on earnings			$ (2,000)
Domestic, State and Local Jurisdictions
Income Tax Examination [Line Items]
Tax charges related to changes in valuation allowances as a result of the Tax Act		$ 488
State
Income Tax Examination [Line Items]
Income tax charges related to change in valuation allowance				$ 473
Additional valuation allowances	56
Domestic Tax Authority
Income Tax Examination [Line Items]
Additional valuation allowances	$ 438
Deferred tax asset valuation allowance
Income Tax Examination [Line Items]
Provision for (benefit from) taxes on earnings		10	166	(848)
Valuation allowance on deferred tax assets		8,225	8,209	2,789	$ 2,095
Valuation allowance offsetting current activity		$ (738)	$ 5,028	$ 0