Taxes on Earnings (Details) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020 USD ($) country	Apr. 30, 2019 USD ($)	Apr. 30, 2020 USD ($) country	Apr. 30, 2019 USD ($)
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	7.60%	15.40%	11.40%	11.10%
Net tax benefit	$ 59	$ 40	$ 66	$ 49
Tax benefits related to audit settlements	42		40
Tax benefits related to acquisition charges	11		17
Tax benefits related to restructuring charges	7	14	55	26
Uncertain tax position charges	3	12	51	32
Tax benefits related to one-time items		42		48
Tax benefits related other tax charges		4		14
Tax Cuts and Jobs Act, tax benefit				21
Excess tax benefits				20
Unrecognized tax benefits	965		965
Unrecognized tax benefits that would affect effective tax rate if realized	818		818
Unrecognized tax benefits change			36
Accrued income tax payable for interest and penalties	29	$ 193	$ 29	$ 193
Likelihood of no resolution period			12 months
Reasonably possible decrease in existing unrecognized tax benefits within the next 12 months	$ 86		$ 86
Other countries with income tax jurisdiction | country	58		58