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Stockholders Equity (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2013
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense $ 8 $ 21 $ 15 $ 16
Options exercised or cash settled amount   $ 41    
2015 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for grant   7,500,000    
Shares issued   0    
Additional cost for additional shares authorized   $ 5