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Guarantees (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 25, 2016
Sep. 25, 2015
Guarantees [Abstract]    
Performance guarantee obligations for 2012 separation, fair value $ 3 $ 3
Performance guarantee obligations for 2007 separation, fair value 3 $ 3
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Warranty accrual, balance at the beginning of the period 29  
Warranties issued 4  
Changes in estimates (1)  
Settlements (3)  
Warranty accrual, balance at the end of the period $ 29