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Goodwill and Acquired Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill by Operating Segment
The following table identifies the activity relating to goodwill by operating segment:
In millions
Balance at December 31, 2016
 
Additions
 
Currency
Translation
Adjustments
 
Balance at December 31, 2017
Goodwill
 
 
 
 
 
 
 
Americas Data and Analytics
$
251

 
$
2

 
$
—

 
$
253

International Data and Analytics
139

 
—

 
7

 
146

Total goodwill
$
390

 
$
2

 
$
7

 
$
399
Gross Carrying Amount and Accumulated Amortization for Teradata's Acquired Intangible Assets
The gross carrying amount and accumulated amortization for Teradata’s acquired intangible assets were as follows: 
 
 
 
December 31, 2017
 
December 31, 2016
In millions
Amortization
Life (in Years)
 
Gross 
Carrying Amount
 
Accumulated
Amortization
and Currency
Translation
Adjustments
 
Gross
 Carrying
Amount
 
Accumulated
Amortization
and Currency
Translation
Adjustments
Acquired intangible assets
 
 
 
 
 
 
 
 
 
Intellectual property/developed technology
1 to 7
 
$
43

 
$
(20
)
 
$
71

 
$
(61
)
Trademarks/trade names
5
 
—

 
—

 
1

 
(1
)
In-process research and development
5
 
—

 
—

 
5

 
(4
)
Total
 
 
$
43

 
$
(20
)
 
$
77

 
$
(66
)
Aggregate Amortization Expense for Acquired Intangible Assets
The aggregate amortization expense (actual and estimated) for acquired intangible assets for the following periods is:
 
Actual
 
For the years ended (estimated)
In millions
2015
 
2016
 
2017
 
2018
 
2019
 
2020
 
2021
 
2022
 
Amortization expense
$
40

 
$
10

 
$
8

 
$
7

 
$
6

 
$
4

 
$
4

 
$
2