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Other Intangible Assets
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets
Intangible Assets

The components of intangible assets were as follows:
 
December 31, 2016
 
December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
Gross
 
 
 
Net
 
Gross
 
 
Net
 
Carrying
 
Accumulated
 
Intangible
 
Carrying
 
Accumulated
Intangible
(Dollars in millions)
Amount
 
Amortization
 
Assets
 
Amount
 
Amortization
Assets
Acquired technology
$
373

 
$
(300
)
 
$
73

 
$
386

 
$
(291
)
$
95

Licenses
177

 
(166
)
 
11

 
234

 
(176
)
58

Patents
215

 
(134
)
 
81

 
233

 
(123
)
110

Customer relationships and contracts
193

 
(144
)
 
49

 
198

 
(139
)
59

Other
91

 
(57
)
 
34

 
88

 
(54
)
34

 
$
1,049

 
$
(801
)
 
$
248

 
$
1,139

 
$
(783
)
$
356



Additions to intangible assets were $11 million and $26 million for the years ended December 31, 2016 and 2015, respectively. During 2016, we recognized $48 million of license and patent impairment charges related to the Well Construction and Completions businesses.

Amortization expense was $60 million, $88 million and $108 million for the years ended December 31, 2016, 2015 and 2014, respectively. Future estimated amortization expense for the carrying amount of intangible assets as of December 31, 2016 is expected to be as follows (dollars in millions): 
Period
Amount

2017
$
57

2018
47

2019
41

2020
34

2021
21