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Intangible Assets
 6 Months Ended
Mar. 01, 2012
Notes to Financial Statements [Abstract]  
Intangible Assets
Intangible Assets

As of
 
March 1, 2012
 
September 1, 2011
 
 
Gross
Amount
 
Accumulated
Amortization
 
Gross
Amount
 
Accumulated
Amortization
Product and process technology
 
$
590

 
$
(228
)
 
$
571

 
$
(203
)
Customer relationships
 
127

 
(90
)
 
127

 
(82
)
Other
 
1

 
—

 
1

 
—

 
 
$
718

 
$
(318
)
 
$
699

 
$
(285
)


During the first six months of 2012 and 2011, we capitalized $30 million and $24 million, respectively, for product and process technology with weighted-average useful lives of 9 years.

Amortization expense for intangible assets was $22 million and $44 million for the second quarter and first six months of 2012 and $18 million and $37 million for the second quarter and first six months of 2011, respectively.  Annual amortization expense is estimated to be $88 million for 2012, $83 million for 2013, $75 million for 2014, $57 million for 2015 and $49 million for 2016.