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Shareholders' Equity (Components Of AOCI, Net Of Tax) (Detail) (USD $)
In Millions, unless otherwise specified
Jul. 28, 2012
Jul. 30, 2011
Jul. 31, 2010
Shareholders' Equity [Abstract]      
Net unrealized gains on investments $ 409 $ 487 $ 333
Net unrealized (losses) gains on derivative instruments (53) 6 27
Cumulative translation adjustment and other 305 801 263
Total $ 661 $ 1,294 $ 623