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Guarantees (Tables)
 12 Months Ended
Sep. 27, 2013
Guarantees [Abstract]  
Product warranty accrual
The changes in the carrying amount of the Company's warranty accrual from September 28, 2012 to September 27, 2013 were as follows ($ in millions):
 
 
Balance as of September 28, 2012
$
30

Warranties issued
16

Changes in estimates
(4
)
Settlements
(11
)
Balance as of September 27, 2013
$
31