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Components of Accumulated Other Comprehensive Income, Net of Taxes (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Sep. 24, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net unrealized gains/losses on marketable securities $ 393 $ 130
Net unrecognized gains/losses on derivative instruments 105 290
Cumulative foreign currency translation 26 23
Accumulated other comprehensive income $ 524 $ 443