Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) (USD $) In Millions, unless otherwise specified									6 Months Ended
	Mar. 29, 2014 U.S. Treasury and Agency [Member]	Sep. 28, 2013 U.S. Treasury and Agency [Member]	Mar. 29, 2014 Corporate And Asset-Backed [Member]	Sep. 28, 2013 Corporate And Asset-Backed [Member]	Mar. 29, 2014 Common Stock and Warrants [Member]	Sep. 28, 2013 Common Stock and Warrants [Member]	Mar. 29, 2014 Level 1 [Member]	Mar. 29, 2014 Level 2 [Member]	Mar. 29, 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)	0	0	1	1	0	(5)
Number of shares of Syntroleum Corporation acquired							0.8
Shares able to be purchased through warrants								0.4
Exercise price of warrants, per share								28.70
Amortized Cost Basis	26	25	66	64	3	9
Fair Value	$ 26	$ 25	$ 67	$ 65	$ 3	$ 4