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Taxes on Earnings (Detail 3) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								9 Months Ended	12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Jul. 31, 2018	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Income Tax Examination [Line Items]
Income tax benefits related to items unique to the year										$ (2,000)	$ 554	$ (250)
Provision for (benefit from) taxes on earnings	$ 1,348	$ 13	$ (966)	$ (2,139)	$ (679)	$ (160)	$ 591	$ 84		(1,744)	(164)	623
Income tax benefits related to acquisition, separation, divestiture										208	88
Valuation allowance on deferred tax assets	8,209				2,789					8,209	2,789
Income tax charges related to tax indemnification											699
Settlement of pre-separation liabilities										125	326
Share-based compensation cost										65
Income tax benefits related to restructuring and separation related costs												647
Income tax benefits for adjustments to uncertain tax positions												169
Income tax charges related to state tax impacts												124
Income tax benefits, reduced rates for subsidiaries in certain countries										$ 792	$ 378	$ 401
Income tax benefits, reduced rates for subsidiaries in certain countries (in dollars per share)										$ 0.51	$ 0.23	$ 0.23
U.S. federal statutory income tax rate									23.30%	23.30%	35.00%	35.00%
Transition tax										$ 1,700
Estimated change in income tax expense (benefit)										(1,700)
Tax benefit related to reversal of deferred tax recognized	3,700									3,700
Estimated deferred tax asset valuation alllowance										687
Spinoff | Everett SpinCo, Inc. and Seattle SpinCo, Inc.
Income Tax Examination [Line Items]
Provision for (benefit from) taxes on earnings										(2,000)
Disposed of by sale | HC3
Income Tax Examination [Line Items]
Provision for (benefit from) taxes on earnings											$ 473
State
Income Tax Examination [Line Items]
Valuation allowance on deferred tax assets	422									422
Income tax benefits related to valuation allowances												$ 714
Foreign
Income Tax Examination [Line Items]
Income tax benefits related to valuation allowances												(509)
Deferred tax asset valuation allowance
Income Tax Examination [Line Items]
Provision for (benefit from) taxes on earnings										166	(848)	203
Valuation allowance on deferred tax assets	$ 8,209				$ 2,789					8,209	2,789	2,095	$ 1,572
Valuation allowance offsetting current year losses recorded										$ 5,028	$ 0	$ 0

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