Taxes on Earnings - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Oct. 31, 2017
Income Tax Examination [Line Items]
Effective tax rate (as a percent)	2.80%	(128.00%)	1003.90%	89.90%
Net income tax charges (benefits)	$ (68)	$ (290)	$ (3,300)	$ 236
Release of non-U.S. valuation allowances on deferred tax assets	38		38
Income tax benefits from U.S. tax reform	33		713
Net excess tax benefits related to stock compensation	26		68
Income tax benefit on restructuring charges, separation costs, transformation costs and acquisition and other related charges		61	74	129
Pre-Separation tax matters	7		2,000
Foreign tax credit			228
Benefit from liquidation of business			$ 203
U.S. provision-to-return adjustments		29		29
Accrued divestiture tax		189		189
Tax indemnification		26		57
Valuation allowance				473
Reduction resulting from lapse of applicable statute of limitations		$ 25		25
Federal statutory rate (as a percent)			23.30%
Transition tax			$ 1,100
Provisional tax benefit from Tax Cut and Jobs Act			1,800
Unrecognized tax benefits	8,700		8,700		$ 11,300
Unrecognized tax benefits that would affect effective tax rate if realized	1,100		1,100		3,000
Decrease from settlements with IRS			2,600
Accrued income tax for interest and penalties	179		$ 179		$ 304
Likelihood of no resolution period			12 months
Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months	$ 85		$ 85
Likelihood of conclusion period for certain federal, foreign and state tax issues			12 months
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Everett SpinCo
Income Tax Examination [Line Items]
Net income tax charges (benefits)				$ (79)