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Intangible Assets
 3 Months Ended
Dec. 01, 2011
Notes to Financial Statements [Abstract]  
Intangible Assets
Intangible Assets

As of
 
December 1, 2011
 
September 1, 2011
 
 
Gross
Amount
 
Accumulated
Amortization
 
Gross
Amount
 
Accumulated
Amortization
Product and process technology
 
$
575

 
$
(216
)
 
$
571

 
$
(203
)
Customer relationships
 
127

 
(86
)
 
127

 
(82
)
Other
 
1

 
—

 
1

 
—

 
 
$
703

 
$
(302
)
 
$
699

 
$
(285
)


During the first quarters of 2012 and 2011, we capitalized $9 million and $8 million, respectively, for product and process technology with weighted-average useful lives of 10 years.

Amortization expense for intangible assets was $22 million and $19 million for the first quarters of 2012 and 2011, respectively.  Annual amortization expense is estimated to be $87 million for 2012, $81 million for 2013, $72 million for 2014, $54 million for 2015 and $47 million for 2016.