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Intangible Assets
 12 Months Ended
Aug. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

As of
 
2014
 
2013
 
 
Gross
Amount
 
Accumulated
Amortization
 
Gross
Amount
 
Accumulated
Amortization
Product and process technology
 
$
809

 
$
(341
)
 
$
642

 
$
(269
)
Customer relationships
 
1

 
(1
)
 
127

 
(114
)
 
 
$
810

 
$
(342
)
 
$
769

 
$
(383
)


During 2014 and 2013, we capitalized $177 million and $100 million, respectively, for product and process technology with weighted-average useful lives of 6 years and 7 years, respectively. Amortization expense was $110 million, $83 million and $88 million for 2014, 2013 and 2012, respectively.  Annual amortization expense is estimated to be $112 million for 2015, $98 million for 2016, $88 million for 2017, $77 million for 2018 and $31 million for 2019.