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Computer Software (Tables)
 12 Months Ended
Dec. 31, 2018
Research and Development [Abstract]  
Computer Software
Intangible assets as of December 31, 2018 consist of the following (in millions):
 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships and other
$
6,011

 
$
(2,944
)
 
$
3,067

Finite-lived trademarks
68

 
(46
)
 
22

Indefinite-lived trademarks
43

 
—

 
43

Total intangible assets, net
$
6,122

 
$
(2,990
)
 
$
3,132


Intangible assets as of December 31, 2017 consist of the following (in millions):

 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships and other
$
6,220

 
$
(2,427
)
 
$
3,793

Finite-lived trademarks
101

 
(57
)
 
44

Indefinite-lived trademarks
48

 
—

 
48

Total intangible assets, net
$
6,369

 
$
(2,484
)
 
$
3,885

Computer software as of December 31, 2018 and 2017 consists of the following (in millions):
 
2018
 
2017
Software from business acquisitions
$
1,116

 
$
1,130

Capitalized software development costs
1,624

 
1,422

Purchased software
363

 
310

Computer software
3,103

 
2,862

Accumulated amortization
(1,308
)
 
(1,134
)
Total computer software, net
$
1,795

 
$
1,728