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		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Pre-tax effect of derivative instruments in cash flow hedging relationships
Loss Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)	$ (70)	$ (145)	$ (239)	$ (40)
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	16	62	87	96
Net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	39	88	115	166
Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	(19)	(32)	(19)	(72)
Interest and other, net
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	$ (4)	$ 6	$ (9)	$ 2