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Stock Based Compensation
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
STOCK BASED COMPENSATION STOCK BASED COMPENSATION
Restricted Stock Units (RSUs) and Restricted Stock Awards (RSAs)
Time-based RSUs and RSAs generally vest over a four-year term. Performance-based RSUs and RSAs are subject to vesting requirements and are earned, in part, based on certain financial performance metrics as defined in the grant notice. Actual number of shares earned may range from 0% to 200% of the target award. Performance-based awards granted in 2021 and 2020 are earned based on a single-year performance period subject to subsequent multi-year time-based vesting with 50% of the shares earned vesting in one year after the performance period and the remaining shares in the year after. RSUs and RSAs are generally forfeited if the participant terminates service prior to vesting.
The following tables summarize RSU and RSA activity for the six months ended June 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 
Granted491,136 — 491,136 82.72 
Vested(343,508)(12,797)(356,305)50.45 
Forfeited(94,764)— (94,764)58.05 
Nonvested at June 30, 20211,282,935 17,229 1,300,164 $65.57 
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 June 30, 2021

401,007 — 401,007 $62.24 
Stock Based Compensation
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)2021202020212020
Cost of providing services$3 $3 $6 $5 
Sales and marketing2 1 3 3 
General and administrative7 6 13 11 
Systems development and programming costs1 1 2 1 
Total stock based compensation expense$13 $11 $24 $20