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Fair Value Measurements (Details) (USD $)
In Millions
12 Months Ended
Sep. 25, 2011
Sep. 26, 2010
Sep. 27, 2009
Nonrecurring Fair Value Measurements [Abstract]   
Goodwill balance prior to impairment for Firethorn reporting unit$ 154  
Goodwill balance for Firethorn reporting unit40  
Goodwill Impairment Charge$ 114$ 0$ 0