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Other Intangible Assets
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets
Intangible Assets

The components of intangible assets were as follows:
 
December 31, 2017
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
Gross
 
 
 
Net
 
Gross
 
 
Net
 
Carrying
 
Accumulated
 
Intangible
 
Carrying
 
Accumulated
Intangible
(Dollars in millions)
Amount
 
Amortization
 
Assets
 
Amount
 
Amortization
Assets
Acquired technology
$
390

 
$
(334
)
 
$
56

 
$
373

 
$
(300
)
$
73

Licenses
175

 
(168
)
 
7

 
177

 
(166
)
11

Patents
223

 
(144
)
 
79

 
215

 
(134
)
81

Customer Relationships and Contracts
197

 
(160
)
 
37

 
193

 
(144
)
49

Other
98

 
(64
)
 
34

 
91

 
(57
)
34

 
$
1,083

 
$
(870
)
 
$
213

 
$
1,049

 
$
(801
)
$
248



Additions to intangible assets were $16 million and $11 million for the years ended December 31, 2017 and 2016, respectively. During 2016, we recognized $48 million of license and patent impairment charges related to the Well Construction and Completions businesses.

Amortization expense was $52 million, $60 million and $88 million for the years ended December 31, 2017, 2016 and 2015, respectively. Future estimated amortization expense for the carrying amount of intangible assets as of December 31, 2017 is expected to be as follows (dollars in millions): 
Period
Amount

2018
$
48

2019
42

2020
32

2021
20

2022
13