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Shareholders' Equity (Stock Repurchase Program) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Apr. 27, 2013
Stock Repurchase Program [Roll Forward]
Cumulative shares repurchased, beginning balance	3,740
Repurchase of common stock under the stock repurchase program	81
Cumulative shares repurchased, ending balance	3,821
Cumulative weighted-average price per share, beginning balance	$ 20.36
Repurchase of common stock under the stock repurchase program, weighted -average price per share	$ 19.81
Cumulative weighted-average price per share, ending balance	$ 20.35
Cumulative amount repurchased, beginning balance	$ 76,133
Repurchase of common stock under the stock repurchase program, amount	1,613
Cumulative amount repurchased, ending balance	$ 77,746

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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