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Acquistions Pro forma Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Oct. 28, 2018
Oct. 29, 2017
Business Acquisition, Pro Forma Information [Abstract]    
Business Acquisition, Pro Forma Revenue   $ 2,808
Business Acquisition, Pro Forma Net Income (Loss)   $ 189
Business Acquisition, Pro Forma Earnings Per Share, Basic   $ 0.63
Business Acquisition, Pro Forma Earnings Per Share, Diluted   $ 0.63
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (4) $ 0