Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)	$ 180	$ 273	$ 271	$ 19
Foreign currency contracts | Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)	180	273	271	19
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	86	(17)	259	(363)
Foreign currency contracts | Cash flow hedges | Net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	98	(20)	289	(349)
Foreign currency contracts | Cash flow hedges | Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	(12)	4	(28)	(14)
Foreign currency contracts | Cash flow hedges | Operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	$ 0	$ (1)	$ (2)	$ 0