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

Other intangible assets as of December 31, 2016 and 2015 were as follows (dollars in millions):

 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
December 31, 2016
 
 
 
 
 
Finite-Lived Intangible Assets:
 
 
 
 
 
Customer Contracts and Relationships
$
1,973

 
$
(1,113
)
 
$
860

Trademarks
55

 
(55
)
 
—

Patents and Developed Technology
229

 
(189
)
 
40

 
2,257

 
(1,357
)
 
900

Indefinite-Lived Intangible Assets:
 
 
 
 
 
Trade Name
15

 
—

 
15

 
$
2,272

 
$
(1,357
)
 
$
915

December 31, 2015
 
 
 
 
 
Finite-Lived Intangible Assets:
 
 
 
 
 
Customer Contracts and Relationships
$
1,975

 
$
(932
)
 
$
1,043

Trademarks
55

 
(55
)
 
—

Patents and Developed Technology
230

 
(161
)
 
69

 
2,260

 
(1,148
)
 
1,112

Indefinite-Lived Intangible Assets:
 
 
 
 
 
Trade Name
15

 
—

 
15

 
$
2,275

 
$
(1,148
)
 
$
1,127



During the fourth quarter of 2016 and 2015, we conducted our long-lived assets and indefinite-lived intangible assets impairment analysis and concluded that there was no impairment in 2016 and 2015.

Finite-lived intangible assets amortization expense was $211 million in 2016, $227 million in 2015 and $95 million in 2014.

At December 31, 2016, the weighted average remaining useful lives of our finite-lived intangible assets was 4.8 years in total; 4.9 years for customer contracts and relationships and 2.8 years for patents and developed technology.

As of December 31, 2016, estimated amortization expense for our finite-lived intangible assets over the next five years and thereafter is as follows (dollars in millions):

2017
$
196

2018
193

2019
181

2020
166

2021
143

Thereafter
21

 
$
900