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

The components of intangible assets were as follows:
 
December 31, 2014
 
December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Assets
 
 
 
 
 
Gross
 
 
 
 
 
Net
 
Gross
 
Classified
 
 
 
Net
 
Carrying
 
Accumulated
 
 
 
Intangible
 
Carrying
 
as Held for
 
Accumulated
 
Intangible
(Dollars in millions)
Amount
 
Amortization
 
Impairment
 
Assets
 
Amount
 
Sale
 
Amortization
 
Assets
Acquired technology
$
420

 
$
(287
)
 
$
—

 
$
133

 
$
417

 
(4
)
 
$
(238
)
 
$
175

Licenses
242

 
(169
)
 
—

 
73

 
261

 
(1
)
 
(161
)
 
99

Patents
232

 
(117
)
 
—

 
115

 
271

 
(4
)
 
(129
)
 
138

Customer relationships and contracts
205

 
(122
)
 
(5
)
 
78

 
329

 
(46
)
 
(163
)
 
120

Other
85

 
(38
)
 
(6
)
 
41

 
91

 
(5
)
 
(52
)
 
34

 
$
1,184

 
$
(733
)
 
$
(11
)
 
$
440

 
$
1,369

 
$
(60
)
 
$
(743
)
 
$
566



We have trademarks that are considered to have indefinite lives as we have the ability and intent to renew them indefinitely. These trademarks had a carrying value of $7 million and $12 million at December 31, 2014 and 2013, respectively, and are included in the Other caption in the table above. During 2014 we recognized an impairment charge to indefinite lived trademarks of $5 million. In addition, we recognized other intangible asset impairments of $6 million, largely related to our Rigs business.

Additions to intangible assets were $5 million and $15 million for the years ended December 31, 2014 and 2013, respectively.

Amortization expense was $108 million, $120 million and $122 million for the years ended December 31, 2014, 2013 and 2012, respectively. Future estimated amortization expense for the carrying amount of intangible assets as of December 31, 2014 is expected to be as follows (dollars in millions): 
Period
Amount

2015
$
71

2016
58

2017
58

2018
54

2019
46