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Investments (Investments at Fair Value) (Details) - USD ($)
$ in Millions
Jul. 03, 2016
Sep. 27, 2015
Sep. 28, 2014
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Current $ 153 $ 155 $ 553
Available-for-sale Securities, Noncurrent 0 63 120
Asset-backed Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Current   10 9
Available-for-sale Securities, Noncurrent   3 4
Certificates of Deposit [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Current   2  
Commercial Paper [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Current     33
Corporate Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Current   15  
Available-for-sale Securities, Noncurrent   15  
Municipal Notes [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Current $ 153 128 455
Municipal Bonds [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Noncurrent   $ 45 $ 75