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Stock Based Compensation
 6 Months Ended
Jun. 30, 2022
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 2022 and 2021 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. The performance-based awards granted in 2019 were previously cancelled. 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, 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 
Zenefits Restricted Stock
In connection with the acquisition of Zenefits (See Note 11), unvested Zenefits restricted stock at the closing of the acquisition were converted to the right to receive a pro-rata share of the total consideration, payable in cash quarterly over 18 months subject to continued service. Unpaid amounts are generally forfeited if the employee terminates service prior to vesting. As of June 30, 2022, the unpaid amount was $10 million.
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)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