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Other Intangible Assets
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets
Other Intangible Assets

The components of intangible assets were as follows:
 
December 31, 2015
 
December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross
 
 
 
Net
 
Gross
 
 
 
 
Net
 
Carrying
 
Accumulated
 
Intangible
 
Carrying
 
Accumulated
 
 
Intangible
(Dollars in millions)
Amount
 
Amortization
 
Assets
 
Amount
 
Amortization
 
Impairment
Assets
Acquired technology
$
386

 
$
(291
)
 
$
95

 
$
420

 
$
(287
)
 
—

$
133

Licenses
234

 
(176
)
 
58

 
242

 
(169
)
 
—

73

Patents
233

 
(123
)
 
110

 
232

 
(117
)
 
—

115

Customer relationships and contracts
198

 
(139
)
 
59

 
205

 
(122
)
 
(5
)
78

Other
88

 
(54
)
 
34

 
85

 
(38
)
 
(6
)
41

 
$
1,139

 
$
(783
)
 
$
356

 
$
1,184

 
$
(733
)
 
$
(11
)
$
440



Additions to intangible assets were $26 million and $5 million for the years ended December 31, 2015 and 2014, respectively. During 2014 we recognized impairment charges to indefinite lived trademarks, as well as other intangible asset impairments primarily related to our Land Drilling Rigs business.

Amortization expense was $88 million, $108 million and $120 million for the years ended December 31, 2015, 2014 and 2013, respectively. Future estimated amortization expense for the carrying amount of intangible assets as of December 31, 2015 is expected to be as follows (dollars in millions): 
Period
Amount

2016
$
64

2017
57

2018
46

2019
38

2020
31