Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($) $ in Millions		Jun. 27, 2015	Sep. 27, 2014
Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost Basis	[1]	$ 0	$ 1
Fair Value		0	1
Unrealized Gain/(Loss)		0	0
Cumulative Other-than-Temporary Impairment Loss		0	2
U.S. Treasury and Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost Basis		32	25
Fair Value		32	25
Unrealized Gain/(Loss)		0	0
Corporate And Asset-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost Basis		60	65
Fair Value		61	67
Unrealized Gain/(Loss)		$ 1	$ 2

[1] At June 27, 2015, and September 27, 2014, the amortized cost basis for Equity Securities had been reduced by accumulated other than temporary impairment of nil and $2 million, respectively.