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Long term-debt (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	May 03, 2015	Aug. 03, 2014	Mar. 19, 2015
Debt Instrument [Line Items]
Long-term Debt	2,562us-gaap_LongTermDebt	$ 2,544us-gaap_LongTermDebt
3.30% notes, due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt			$ 300
Debt Instrument, Interest Rate, Stated Percentage			3.30%
Debt Instrument, Maturity Date	Mar. 19, 2025

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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