Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships (Details) - Foreign currency contracts - Cash flow hedges - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)	$ (519)	$ 175	$ (758)	$ 135
(Loss) Gain Reclassified from Accumulated OCI Into Earnings (Effective Portion)	(38)	(159)	49	(63)
Net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss) Gain Reclassified from Accumulated OCI Into Earnings (Effective Portion)	(26)	(140)	89	26
Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss) Gain Reclassified from Accumulated OCI Into Earnings (Effective Portion)	(13)	(18)	(32)	(90)
Operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss) Gain Reclassified from Accumulated OCI Into Earnings (Effective Portion)	1		1
Interest and other, net
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss) Gain Reclassified from Accumulated OCI Into Earnings (Effective Portion)	$ 0	$ (2)	$ (9)	$ 0