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Stock Based Compensation - (Tables)
 9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of RSU and RSA Activity under Equity-Based Plans
The following tables summarize RSU and RSA activity for the nine months ended September 30, 2022:
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, 20211,008,927 5,744 1,014,671 $68.74 
Granted925,713 — 925,713 87.52 
Vested(446,135)(5,744)(451,879)69.44 
Forfeited(160,524)— (160,524)75.94 
Nonvested at September 30, 20221,327,981 — 1,327,981 $80.72 
Performance-based RSUs
Total Number
of RSUs
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2021255,224 $67.16 
Granted245,808 85.78 
Vested(49,916)52.86 
Forfeited(25,110)85.10 
Nonvested at September 30, 2022426,006 $78.53 
Stock-Based Compensation Expense
Stock based compensation expense for stock-based awards made to our employees pursuant to our equity plans were as follows:  
 Three Months Ended September 30,Nine Months Ended September 30,
(in millions)2022202120222021
Cost of providing services$3 $3 $10 $9 
Sales and marketing2 1 5 5 
General and administrative9 8 28 21 
Systems development and programming costs2 1 3 2 
Total stock based compensation expense$16 $13 $46 $37 
Total stock based compensation capitalized$— $— $1 $1