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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]  
Schedule of Intangible Assets
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

Trademarks
149

 
(57
)
 
92

 
$
6,369

 
$
(2,484
)
 
$
3,885


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

 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships and other
$
6,288

 
$
(1,835
)
 
$
4,453

Trademarks
180

 
(43
)
 
137

 
$
6,468

 
$
(1,878
)
 
$
4,590

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
Schedule of Estimated Amortization of Intangibles
Estimated amortization of intangibles, including the contract intangible in our Brazilian Venture, which is amortized as a reduction in revenue, for the next five years is as follows (in millions):
2018
$
666

2019
655

2020
478

2021
447

2022
429