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Stock Based Compensation - (Tables)
 9 Months Ended
Sep. 30, 2021
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, 2021:
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, 20201,230,071 30,026 1,260,097 $54.04 
Granted528,524 — 528,524 82.67 
Vested(471,212)(18,540)(489,752)53.03 
Forfeited(145,569)— (145,569)60.50 
Nonvested at September 30, 20211,141,814 11,486 1,153,300 $66.78 
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, 2020167,127 16,052 183,179 $52.89 
Granted246,349 — 246,349 67.70 
Vested(3,010)(16,052)(19,062)47.61 
Forfeited(9,459)— (9,459)52.86 
Nonvested at September 30, 2021401,007 — 401,007 $62.24 
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)2021202020212020
Cost of providing services$3 $2 $9 $7 
Sales and marketing1 2 5 5 
General and administrative8 6 21 17 
Systems development and programming costs1 1 2 2 
Total stock based compensation expense$13 $11 $37 $31 
Total stock based compensation capitalized$— $— $1 $1