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Shareholders' Equity (Stock Repurchase Program) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jan. 26, 2013
Stock Repurchase Program [Roll Forward]
Cumulative shares repurchased, beginning balance	3,740
Shares Repurchased Retired During Period Shares	40
Cumulative shares repurchased, ending balance	3,780
Cumulative weighted-average price per share, beginning balance	$ 20.36
Repurchase of common stock under the stock repurchase program, weighted -average price per share	$ 18.73
Cumulative weighted-average price per share, ending balance	$ 20.34
Cumulative amount repurchased, beginning balance	$ 76,133
Repurchase of common stock under the stock repurchase program, amount	753
Cumulative amount repurchased, ending balance	$ 76,886

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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