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Stock Based Compensation - (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of RSU and RSA Activity Under Equity-Based Plans
The following tables summarize RSU and RSA activity under our equity-based plans for the nine months ended September 30, 2020:
Time-based RSUs and RSAs
Total Number
of RSUs
Total Number
of RSAs
Total Number
of Shares
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 20191,104,729 61,136 1,165,865 $48.47 
Granted840,777 — 840,777 52.02 
Vested(514,938)(21,099)(536,037)44.32 
Forfeited(99,518)(3,611)(103,129)50.89 
Nonvested at September 30, 20201,331,050 36,426 1,367,476 $52.09 
Performance-based RSUs and RSAs
Total Number
of RSUs
Total Number
of RSAs
Total Number of Shares
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 201915,752 114,857 130,609 $49.70 
Granted183,981 — 183,981 52.86 
Forfeited— (11,036)(11,036)47.61 
Nonvested at September 30, 2020

199,733 103,821 303,554 $51.69 
Stock-based Compensation Expense Stock based compensation expense and other disclosures for stock based awards made to our employees pursuant to the equity plans was as follows: 
 Three Months Ended September 30,Nine Months Ended September 30,
(in millions)2020201920202019
Cost of providing services$2 $2 $7 $6 
Sales and marketing2 1 5 2 
General and administrative6 5 17 19 
Systems development and programming costs1 1 2 2 
Total stock based compensation expense$11 $9 $31 $29 
Total stock based compensation capitalized$— $— $1 $—