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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 28, 2013
Sep. 28, 2013
U.S. Treasury and Agency [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unrealized Gain/(Loss) $ 0 $ 0
Amortized Cost Basis 27 25
Fair Value 27 25
Corporate And Asset-Backed [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unrealized Gain/(Loss) 1 1
Amortized Cost Basis 63 64
Fair Value 64 65
Common Stock and Warrants [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unrealized Gain/(Loss) 0 (5)
Amortized Cost Basis 3 9
Fair Value 3 4
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 6  
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of shares of Syntroleum Corporation acquired 0.8  
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of warrants to purchase equivalent amount of shares in Syntroleum Corporation 0.4  
Exercise price of warrants, per share 28.70  
Maximum [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short Term Investment Maturity Period 12 months  
Available For Sale Securities Debt Maturity Period 35 years