Accumulated Other Comprehensive Income (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Aug. 03, 2014	Jul. 28, 2013	Jul. 29, 2012
Accumulated Other Comprehensive Income (Loss) [Abstract]
Reclassification of currency translation adjustments realized upon disposal of business, before tax	$ (22)	$ 0	$ 0
Reclassification of currency translation adjustments realized upon disposal of business, after-tax	$ (19)	$ 0	$ 0

Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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