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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($)
$ in Millions
Jul. 01, 2017
Oct. 01, 2016
U.S. Treasury and Agency [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized Cost Basis $ 45 $ 40
Fair Value 45 40
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 52 56
Fair Value 52 57
Unrealized Gain/(Loss) $ 0 $ 1