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Software Development and Intellectual Property Licenses
12 Months Ended
Dec. 31, 2017
Software Development Costs and Intellectual Property Licenses  
Software Development and Intellectual Property Licenses
Software Development and Intellectual Property Licenses
The following table summarizes the components of our capitalized software development costs (amounts in millions):
 
At December 31,
 
2017
 
2016
Internally-developed software costs
$
270

 
$
277

Payments made to third-party software developers
183

 
189

Total software development costs
$
453

 
$
466


As of December 31, 2017 and December 31, 2016, capitalized intellectual property licenses were not material.
Amortization of capitalized software development costs and intellectual property was the following (amounts in millions):
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
Amortization of capitalized software development costs and intellectual property licenses
$
314

 
$
335

 
$
410


Write-offs and impairments of capitalized software development costs and intellectual property licenses were not material for the years ended December 31, 2017, 2016, and 2015.