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Acquistions Pro forma Information (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Aug. 03, 2014
Jul. 28, 2013
Jul. 29, 2012
Business Acquisition, Pro Forma Information [Abstract]      
Business Acquisition, Pro Forma Revenue $ 8,272 $ 8,327 $ 7,941
Business Acquisition, Pro Forma Net Income (Loss) $ 738 $ 684 $ 711
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 2.34 $ 2.16 $ 2.22