Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 25, 2012
Mar. 27, 2011
Nonrecurring Fair Value Measurements [Abstract]    
Goodwill balance subsequent to impairment for Firethorn reporting unit $ 23 $ 40
Goodwill impairment $ 16 $ 114