Taxes on Earnings - Schedule of Deferred Tax Asset Valuation Allowance and Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Movement in Valuation Allowances and Reserves
Balance at beginning of year	$ 7,906	$ 8,807	$ 8,520
Income tax (benefit) expense	(339)	(897)	297
Other comprehensive income, currency translation and charges to other accounts	363	(4)	(10)
Balance at end of year	$ 7,930	$ 7,906	$ 8,807