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Acquistions Pro forma Information (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Oct. 27, 2013
Business Acquisition, Pro Forma Information [Abstract]  
Business Acquisition, Pro Forma Revenue $ 2,169
Business Acquisition, Pro Forma Net Income (Loss) $ 182
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.57