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Computer Software (Tables)
 12 Months Ended
Dec. 31, 2017
Research and Development [Abstract]  
Computer Software
Intangible assets as of December 31, 2017 consist of the following (in millions):
 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships and other
$
6,300

 
$
(2,442
)
 
$
3,858

Trademarks
149

 
(57
)
 
92

 
$
6,449

 
$
(2,499
)
 
$
3,950


Intangible assets as of December 31, 2016 consist of the following (in millions):

 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships and other
$
6,367

 
$
(1,840
)
 
$
4,527

Trademarks
180

 
(43
)
 
137

 
$
6,547

 
$
(1,883
)
 
$
4,664

Computer software as of December 31, 2017 and 2016 consists of the following (in millions):
 
2017
 
2016
Software from business acquisitions
$
1,130

 
$
1,138

Capitalized software development costs
1,422

 
1,066

Purchased software
310

 
172

Computer software
2,862

 
2,376

Accumulated amortization
(1,134
)
 
(768
)
Computer software, net of accumulated amortization
$
1,728

 
$
1,608