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STOCK BASED COMPENSATION - (Tables)
 3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of RSU and RSA Activity under Equity-Based Plans
The following tables summarize RSU activity for the three months ended March 31, 2023:
Time-based RSUs and RSAs
Total Number
of RSUs
Total Number
of Shares
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 20221,198,561 1,198,561 $80.75 
Granted730,146 730,146 76.85 
Vested(135,074)(135,074)74.20 
Forfeited(21,823)(21,823)82.89 
Nonvested at March 31, 20231,771,810 1,771,810 $79.34 
Performance-based RSUs
Total Number
of RSUs
Total Number of Shares
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2022202,586 202,586 $86.82 
Granted177,067 177,067 79.05 
Nonvested at March 31, 2023379,653 379,653 $83.20 
Schedule of 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 March 31,
(in millions)20232022
Cost of providing services$3 $3 
Sales and marketing2 1 
General and administrative5 7 
Systems development and programming costs1 1 
Total stock based compensation expense$11 $12 
Total stock based compensation capitalized$1 $—