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Software Development and Intellectual Property Licenses
6 Months Ended
Jun. 30, 2019
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 June 30, 2019
 
At December 31, 2018
Internally-developed software costs
$
254

 
$
291

Payments made to third-party software developers
20

 
38

Total software development costs
$
274

 
$
329


 
As of both June 30, 2019 and December 31, 2018, capitalized intellectual property licenses were not material.

Amortization of capitalized software development costs and intellectual property licenses was as follows (amounts in millions):

 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Amortization of capitalized software development costs and intellectual property licenses
$
54

 
$
57

 
$
164

 
$
209