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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Jun. 28, 2014
U.S. Treasury and Agency [Member]
Sep. 28, 2013
U.S. Treasury and Agency [Member]
Jun. 28, 2014
Corporate And Asset-Backed [Member]
Sep. 28, 2013
Corporate And Asset-Backed [Member]
Jun. 28, 2014
Common Stock and Warrants [Member]
Sep. 28, 2013
Common Stock and Warrants [Member]
Sep. 28, 2013
Level 1 [Member]
Jun. 28, 2014
Level 2 [Member]
Sep. 28, 2013
Level 2 [Member]
Jun. 28, 2014
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Cumulative Other-than-Temporary Impairment Loss         $ 6          
Short Term Investment Maturity Period                   12 months
Available For Sale Securities Debt Maturity Period                   35 years
Unrealized Gain/(Loss) 1 0 0 1 0 (5)        
Number of shares of Syntroleum Corporation acquired             0.8 0.8    
Shares able to be purchased through warrants                 0.4  
Amortized Cost Basis 26 25 65 64 3 9        
Fair Value $ 27 $ 25 $ 65 $ 65 $ 3 $ 4