Taxes on Earnings - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2017 USD ($)	Jul. 31, 2016 USD ($)	Jul. 31, 2017 USD ($) country	Jul. 31, 2016 USD ($)	Oct. 31, 2016 USD ($)
Income Tax Examination [Line Items]
Effective tax rate (as a percent)	(306.60%)	4.20%	96.80%	5.00%
Divestiture related taxes	$ 164	$ 123	$ 164	$ 123
Valuation allowance	473		$ 473
U.S. federal statutory income tax rate (as a percent)			35.00%
Net income tax charges (benefits)	(250)	125	$ 221	(49)
Income tax benefit on restructuring charges, separation costs, transformation costs and acquisition and other related charges	110	54	251	188
Divestiture related taxes			54
Income tax benefit charges related to U.S. provision-to-return adjustments	29		29
Income tax benefit related to the expiration of statute of limitations on uncertain tax reserves	25		25
Income tax benefits related to net settlement with taxing authorities	44		44
Pre-Separation tax matters	26		$ 57
Tax indemnification		$ 61		$ 22
Number of countries other than the United States where the entity is subject to income tax | country			110
Unrecognized tax benefits	11,200		$ 11,200		$ 11,400
Unrecognized tax benefits that would affect effective tax rate if realized	$ 3,000		3,000		2,900
Settlement repayment period	3 years
Accrued income tax for interest and penalties	$ 287		$ 287		394
Likelihood of no resolution period			12 months
Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months	2,500		$ 2,500
Likelihood of conclusion period for certain federal, foreign and state tax issues			12 months
Advance royalty proceeds received from multi-year intercompany licensing arrangements			$ 439		$ 3,700
Royalty recognition term			5 years
Foreign Tax Authority
Income Tax Examination [Line Items]
Income tax benefits related to net settlement with taxing authorities	$ 455