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Guarantees (Tables)
 6 Months Ended
Mar. 25, 2016
Guarantees [Abstract]  
Product warranty accrual
The changes in the carrying amount of the Company's warranty accrual from September 25, 2015 to March 25, 2016 were as follows ($ millions):
Balance as of September 25, 2015
$
29

Warranties issued
4

Changes in estimates
(1
)
Settlements
(3
)
Balance as of March 25, 2016
$
29