Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships (Details) - Foreign currency contracts - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)	$ 175	$ 292	$ 135	$ 905
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)	(159)	159	(63)	1,049
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)	(140)		26
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)	(18)		(90)
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)	1		1
Cash flow hedges | 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)	$ (2)		$ 0
Cash flow hedges | Continuing Operations
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)		109		490
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)		88		679
Cash flow hedges | Continuing Operations | Net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)		160		825
Cash flow hedges | Continuing Operations | Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)		(46)		(118)
Cash flow hedges | Continuing Operations | Operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)		(1)		(3)
Cash flow hedges | Continuing Operations | 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)		(25)		(25)
Cash flow hedges | Discontinued Operations
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)		183		415
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)		71		370
Net investment hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)		85		208
Gain (Loss) Reclassified from Accumulated OCI Into Earnings (Effective Portion)		0		0
Net investment hedges | Continuing Operations
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)		0		0
Net investment hedges | Continuing Operations | 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)		0		0
Net investment hedges | Discontinued Operations
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion)		85		208
Net investment hedges | Discontinued Operations | 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)		$ 0		$ 0