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Guarantees (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 28, 2012
Sep. 28, 2012
Guarantees disclosure    
Performance guarantee obligations for 2012 separation, fair value $ 3 $ 3
Performance guarantee obligations for 2007 separation, fair value 3 3
Roll-forward of warranty accrual:    
Warranty accrual, balance at the beginning of the period 30  
Warranties issued 3  
Changes in estimates (1)  
Settlements (2)  
Warranty accrual, balance at the end of the period $ 30