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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]  
Schedule of Intangible Assets
Intangible assets as of December 31, 2016 consist of the following (in millions):
 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships
$
6,367

 
$
(1,840
)
 
$
4,527

Trademarks
180

 
(43
)
 
137

 
$
6,547

 
$
(1,883
)
 
$
4,664


Intangible assets as of December 31, 2015 consist of the following (in millions):

 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships
$
6,782

 
$
(1,782
)
 
$
5,000

Trademarks
181

 
(22
)
 
159

 
$
6,963

 
$
(1,804
)
 
$
5,159

Computer software as of December 31, 2016 and 2015 consists of the following (in millions):
 
2016
 
2015
Software from business acquisitions
$
1,138

 
$
1,189

Capitalized software development costs
1,066

 
985

Purchased software
172

 
126

Computer software
2,376

 
2,300

Accumulated amortization
(768
)
 
(716
)
Computer software, net of accumulated amortization
$
1,608

 
$
1,584
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):
2017
$
681

2018
678

2019
667

2020
489

2021
453