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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($)
$ in Millions
Oct. 03, 2015
Sep. 27, 2014
U.S. Treasury and Agency [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized Cost Basis $ 33 $ 25
Fair Value 34 25
Unrealized Gain/(Loss) 1 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
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized Cost Basis [1] 0 1
Fair Value [1] 0 1
Unrealized Gain/(Loss) [1] 0 0
Cumulative Other-than-Temporary Impairment Loss   $ 2
Common Stock and Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cumulative Other-than-Temporary Impairment Loss $ 0  
[1] At October 3, 2015, and September 27, 2014, the amortized cost basis for Equity Securities had been reduced by accumulated other than temporary impairment of approximately nil and $2 million