Stock-based Compensation (Schedule Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Nov. 01, 2015 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Beginning of year, Options | shares	74
Granted, Options | shares	711
Exercised, Options | shares	(21)
Terminated, Options | shares	0
End of year, Options | shares	764
Exercisable at end of period, Options | shares	53
Beginning of period, Weighted-Average Exercise Price | $ / shares	$ 29.91
Granted, Weighted-Average Exercise Price | $ / shares	50.21
Exercised, Weighted-Average Exercise Price | $ / shares	29.91
Terminated, Weighted-Average Exercise Price | $ / shares	0.00
End of period, Weighted-Average Exercise Price | $ / shares	48.79
Exercisable at end of period, Weighted-Average Exercise Price | $ / shares	$ 29.91
Outstanding at end of period, Weighted-Average Remaining Contractual Life (In years)	9 years 2 months
Exercisable at end of period, Weighted-Average Remaining Contractual Life (In years)	2 months
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 2
Exercisable at end of period, Aggregate Intrinsic Value | $	$ 1