Taxes on Earnings - Schedule of (Benefit from) Provision for Taxes on Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
U.S. federal taxes:
Current	$ 189	$ 439	$ (2,206)
Deferred	197	470	1,069
Non-U.S. taxes:
Current	302	288	431
Deferred	4	(123)	76
State taxes:
Current	20	(35)	362
Deferred	38	56	82
Provision for (benefit from) taxes	$ 750	$ 1,095	$ (186)