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Stock Based Compensation - (Tables)
 6 Months Ended
Jun. 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 six months ended June 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 
Granted825,693 — 825,693 88.21 
Vested(289,487)(5,744)(295,231)68.14 
Forfeited(128,729)— (128,729)75.14 
Nonvested at June 30, 20221,416,404 — 1,416,404 $79.63 
Performance-based RSUs and RSAs
Total Number
of RSUs
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2021255,224 $67.16 
Granted213,943 87.52 
Vested(7,393)52.86 
Forfeited(16,432)83.68 
Nonvested at June 30, 2022445,342 $76.57 
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 June 30,Six Months Ended June 30,
(in millions)2022202120222021
Cost of providing services$4 $3 $6 $6 
Sales and marketing2 2 3 3 
General and administrative11 7 19 13 
Systems development and programming costs1 1 2 2 
Total stock based compensation expense$18 $13 $30 $24