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, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Pre-tax effect of derivative instruments in cash flow hedging relationships
Loss Recognized in Other Comprehensive Income (“OCI”) on Derivatives (Effective Portion)	$ 297	$ (70)	$ (254)	$ (239)
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	(276)	16	(346)	87
Net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	(277)	39	(329)	115
Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	0	(19)	(18)	(19)
Operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) 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
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)		$ (4)		$ (9)