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Intangible Assets
 12 Months Ended
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]  
Intangible Assets

9. Intangible Assets

A summary of intangible assets follows:

  

(Stated in millions)

 

 

 

 

 

2014

 

  

2013

 

 

Gross
Book Value

 

  

Accumulated
Amortization

 

  

Net Book
Value

 

  

Gross
Book Value

 

  

Accumulated
Amortization

 

  

Net Book
Value

 

Technology/Technical Know-How

$

1,747

  

  

$

535

  

  

$

1,212

  

  

$

1,960

  

  

$

597

  

  

$

1,363

  

Tradenames

 

1,641

  

  

 

319

  

  

 

1,322

  

  

 

1,647

  

  

 

257

  

  

 

1,390

  

Customer Relationships

 

2,531

  

  

 

523

  

  

 

2,008

  

  

 

2,263

  

  

 

407

  

  

 

1,856

  

Other

 

380

  

  

 

268

  

  

 

112

  

  

 

435

  

  

 

335

  

  

 

100

  

 

$

6,299

  

  

$

1,645

  

  

$

4,654

  

  

$

6,305

  

  

$

1,596

  

  

$

4,709

  

Amortization expense was $344 million in 2014, $330 million in 2013 and $331 million in 2012.

Based on the carrying value of intangible assets at December 31, 2014, amortization expense for the subsequent five years is estimated to be as follows: 2015: $349 million, 2016: $338 million, 2017: $329 million, 2018: $319 million and 2019: $307 million.