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Financial Instruments (Offsetting Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Jan. 26, 2014	Jul. 28, 2013
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivative Asset, Fair Value, Gross Asset	$ 52	$ 32
Derivative Asset, Fair Value, Gross Liability	(5)	(8)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	47	24
Derivative Liability, Fair Value, Gross Liability	8	36
Derivative Liability, Fair Value, Gross Asset	(5)	(8)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ 3	$ 28

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References+ Details