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Intangible Assets and Goodwill
9 Months Ended
Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS AND GOODWILL
INTANGIBLE ASSETS AND GOODWILL

Intangible assets that have finite useful lives are amortized over their estimated useful lives. The latest impairment assessment of goodwill and indefinite lived intangible assets was completed in the fiscal fourth quarter of 2011. Future impairment tests for goodwill and indefinite lived intangible assets will be performed annually in the fiscal fourth quarter, or sooner if warranted, as was the case for certain indefinite lived intangible assets in 2012.

(Dollars in Millions)
 
September 30, 2012
 
January 1, 2012
Intangible assets with definite lives:
 
 
 
 
Patents and trademarks — gross
 
$
8,874

 
7,947

Less accumulated amortization
 
3,317

 
2,976

Patents and trademarks — net
 
5,557

 
4,971

Customer relationships and other intangibles — gross
 
18,646

 
8,716

Less accumulated amortization
 
3,891

 
3,432

Customer relationships and other intangibles — net
 
14,755

 
5,284

Intangible assets with indefinite lives:
 
 
 
 
Trademarks
 
7,521

 
6,034

Purchased in-process research and development
 
957

 
1,849

Total intangible assets with indefinite lives
 
8,478

 
7,883

Total intangible assets — net
 
$
28,790

 
18,138



Goodwill as of September 30, 2012 was allocated by segment of business as follows:
(Dollars in Millions)
 
Consumer
 
Pharm
 
Med Dev & Diag
 
Total
Goodwill, net at January 1, 2012
 
$
8,298

 
1,721

 
6,119

 
16,138

Acquisitions
 

 
48

 
5,451

 
5,499

Currency translation/Other
 
161

 
(1
)
 
(20
)
 
140

Goodwill, net as of September 30, 2012
 
$
8,459

 
1,768

 
11,550

 
21,777



The weighted average amortization periods for patents and trademarks and customer relationships and other intangible assets are 17 years and 24 years, respectively. The amortization expense of amortizable intangible assets was $866 million and $611 million for the fiscal nine months ended September 30, 2012 and October 2, 2011, respectively, and the estimated amortization expense for the five succeeding years approximates $1,340 million, before tax, per year. Amortization expense is included in cost of products sold.

Intangible assets and goodwill increased by $12.9 billion and $5.4 billion respectively, related to the Synthes acquisition. The Intangible assets and goodwill related to the Synthes acquisition were based on the preliminary purchase price allocation. See Note 10 to the Consolidated Financial Statements for additional details on Synthes.The increase in intangible assets was partially offset by $0.9 billion in intangible asset write-downs and a $1.1 billion impairment of purchased in-process research and development, primarily related to the discontinuation of the Phase III clinical development of bapineuzumab IV and the partial impairment related to the Crucell vaccine business.