Taxes on Earnings - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Oct. 31, 2018
Income Tax Examination [Line Items]
Effective tax rate (as a percent)	73.00%	325.60%
Net income tax charges (benefits)	$ 428	$ (2,200)
Pre-Separation tax matters	34
Income tax benefit on restructuring charges, separation costs, transformation costs and acquisition and other related charges	30	44
Accrued divestiture tax		920
Income tax benefits from U.S. tax reform		806
Benefit from liquidation of business		203
Foreign tax credit		244
Net excess tax benefits related to stock compensation		$ 14
Additional tax charge	426
Transition tax	7
Withholding tax charges	37
Unrecognized tax benefits	8,900		$ 8,800
Unrecognized tax benefits that would affect effective tax rate if realized	1,100
Accrued income tax for interest and penalties	$ 167		$ 142
Likelihood of no resolution period	12 months
Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months	$ 6,400
Likelihood of conclusion period for certain federal, foreign and state tax issues	12 months
Domestic and State and Local Jurisdictions [Member]
Income Tax Examination [Line Items]
Release of non-U.S. valuation allowances on deferred tax assets	$ 375
Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Valuation allowance of deferred tax assets	438
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Valuation allowance of deferred tax assets	$ (56)