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Software Development and Intellectual Property Licenses
3 Months Ended
Mar. 31, 2022
Software Development Costs and Intellectual Property Licenses  
Software Development and Intellectual Property Licenses
2. Software Development and Intellectual Property Licenses

Our total capitalized software development costs of $722 million and $660 million as of March 31, 2022 and December 31, 2021, respectively, primarily relate to internal development costs. As of both March 31, 2022 and December 31, 2021, 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 March 31,
 20222021
Amortization of capitalized software development costs and intellectual property licenses$79 $112