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Derivative Instruments (Effect Of Derivative Instruments Not Designated As Hedges On Consolidated Statement Of Operations Summary) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 28, 2012	Jan. 29, 2011
Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	$ (93)	$ 32	$ (163)	$ 162
Foreign Currency Derivatives [Member] \| Other Income [Member] \| Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	(88)	16	(145)	130
Total Return Swaps-Deferred Compensation [Member] \| Operating Expenses [Member] \| Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	10	13	(10)	24
Total Return Swaps-Deferred Compensation [Member] \| Cost Of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	3		3
Equity Derivatives [Member] \| Other Income [Member] \| Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	$ (18)	$ 3	$ (11)	$ 8

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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