Taxes on Earnings (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019 USD ($) country	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($) country	Jul. 31, 2018 USD ($)
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	(375.40%)	13.60%	(36.10%)	(93.20%)
Net tax benefit	$ 1,100	$ 7	$ 1,100	$ 2,200
Tax benefits related to audit settlements	1,000		1,000	1,500
Effective Income Tax Rate Reconciliation, Utilization of Tax Attributes	75		75
Provision to return adjustments	57		78
Valuation allowance charges	98		98
Excess tax benefits from stock options, restricted stock and performance share units			21
Tax benefits from acquisition charges		12
Other charges		5
Deferred tax liability on unremitted earnings				5,500
Provisional deemed repatriation tax				3,200
Remeasurement of deferred assets and liabilities				1,200
Provisional tax expense				379
Excess tax benefits from stock options, restricted stock units and performance-adjusted restricted stock units		2		36
Unrecognized tax benefits	896		896
Unrecognized tax benefits that would affect effective tax rate if realized	780		780
Decrease in gross unrecognized tax benefits			6,900
Accrued income tax payable for interest and penalties	75	$ 149	$ 75	$ 149
Likelihood of no resolution period			12 months
Conclusion of federal, foreign and state tax issues, period			12 months
Reasonably possible decrease in existing unrecognized tax benefits within the next 12 months	$ 28		$ 28
Other countries with income tax jurisdiction | country	60		60