Taxes on Earnings (Details 7) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Carryforward
U.S. foreign tax credits	$ 1,271
U.S. research and development and other credits	149
Tax credits in state and foreign jurisdictions	174
Balance at end of year	1,594
Valuation Allowance
U.S. foreign tax credits	(1,227)
U.S. research and development and other credits	(2)
Tax credits in state and foreign jurisdictions	(91)
Balance at end of year	(1,320)
Valuation allowance balance
Balance at beginning of year	8,209
Income tax expense	(504)	$ 1,744	$ 164
Balance at end of year	8,225	8,209
Increase (decrease) in valuation allowances	16	5,400
Deferred tax asset valuation allowance
Valuation allowance balance
Balance at beginning of year	8,209	2,789	2,095
Income tax expense	(10)	(166)	848
Income tax expense related to the Tax Act	488	687	0
Valuation allowance offsetting current activity	(738)	5,028	0
Other comprehensive income, currency translation and charges to other accounts	276	(129)	(154)
Balance at end of year	$ 8,225	$ 8,209	$ 2,789