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STOCK BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity Under Equity-Based Plans | The following table summarizes stock option activity for the year ended December 31, 2021:
| Number of Shares | Weighted Average Exercise Price | Weighted Average Remaining Contractual Term (in years) | Aggregate Intrinsic Value (in millions)
Balance at December 31, 2020 | 379,985 |  | $ | 15.10 |  | 3.2 | $ | 25 |
Exercised | (73,118) |  | 10.20 |  |  |
Balance at December 31, 2021 (1) | 306,867 |  | $ | 16.20 |  | 2.2 | $ | 24 |
(1) All options are vested and exercisable.
Additional Disclosure for Stock Options |
| Year Ended December 31,
Additional Disclosures for Stock Options (in millions) | 2021 | 2020 | 2019
Total fair value of options vested | $ | — |  | $ | — |  | $ | 1 |
Total intrinsic value of options exercised | 6 |  | 4 |  | 9 |
Cash received from options exercised | 1 |  | 1 |  | 2 |
Summary of RSU and RSA Activity Under Equity-Based Plans | The following tables summarize RSU and RSA activity for the year ended December 31, 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, 2020 | 1,230,071 |  | 30,026 |  | 1,260,097 |  | $ | 54.04 |
Granted | 562,881 |  | — |  | 562,881 |  | 83.71 |
Vested | (603,674) |  | (24,282) |  | (627,956) |  | 54.91 |
Forfeited | (180,351) |  | — |  | (180,351) |  | 60.96 |
Nonvested at December 31, 2021 | 1,008,927 |  | 5,744 |  | 1,014,671 |  | $ | 68.74 |
| Year Ended December 31,
Additional Disclosures for equity-based plans | 2021 | 2020 | 2019
Total grant date fair value of shares granted (in millions) | $ | 47 |  | $ | 50 |  | $ | 38 |
Total grant date fair value of shares vested (in millions) | $ | 34 |  | $ | 31 |  | $ | 30 |
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees | 207,603 |  | 230,569 |  | 315,762 |
Performance-based RSUs and RSAs
| Total Number of RSUs | Total Number of RSAs | Total Number Shares | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2020 | 167,127 |  | 16,052 |  | 183,179 |  | $ | 52.89 |
Granted | 246,349 |  | — |  | 246,349 |  | 67.70 |
Vested | (145,207) |  | (16,052) |  | (161,259) |  | 52.24 |
Forfeited | (13,045) |  | — |  | (13,045) |  | 61.33 |
Nonvested at December 31, 2021 | 255,224 |  | — |  | 255,224 |  | $ | 67.16 |
Additional Disclosures for Equity-Based Plans |
| Year Ended December 31,
Additional Disclosures for equity-based plans | 2021 | 2020 | 2019
Total grant date fair value of shares granted (in millions) (1) | $ | 16 |  | $ | 10 |  | $ | 4 |
Total grant date fair value of shares vested (in millions) | $ | 8 |  | $ | 5 |  | $ | 11 |
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees | 77,787 |  | 48,787 |  | 135,877 |
(1) Amount includes fair value of finalized additional grant related to the most recently ended performance period.
Weighted-Average Assumptions Used to Estimate Fair Value of Stock Options | In applying the Black Scholes option valuation model for the ESPP options, we use the following assumptions:
| Year Ended December 31,
(in millions) | 2021 | 2020 | 2019
Expected Term (in Years) | 0.5 | 0.5 | 0.5
Expected Volatility | 21-35% | 40-83% | 27-42%
Risk-Free Interest Rate | 0.4-0.7% | 0.2-1.6% | 1.6-2.5%
Expected Dividend Yield | 0 | % | 0 | % | 0 | %
Shares Issued under ESPP | 136,861 |  | 236,887 |  | 207,324 |
Stock-based Compensation Expense | Stock based compensation expense and other disclosures for stock based awards made to our employees pursuant to the equity plans were as follows:
| Year Ended December 31,
(in millions) | 2021 | 2020 | 2019
Cost of providing services | $ | 12 |  | $ | 9 |  | $ | 8 |
Sales and marketing | 6 |  | 6 |  | 3 |
General and administrative | 29 |  | 26 |  | 28 |
Systems development and programming costs | 3 |  | 2 |  | 2 |
Total stock based compensation expense | $ | 50 |  | $ | 43 |  | $ | 41 |
Total stock based compensation capitalized | $ | 1 |  | $ | 1 |  | $ | 1 |
Income tax benefit related to stock based compensation expense | $ | 10 |  | $ | 9 |  | $ | 11 |
Tax benefit realized from stock options exercised and similar awards | $ | 16 |  | $ | 14 |  | $ | 18 |
The table below summarizes unrecognized compensation expense for the year ended December 31, 2021 associated with the following:
| Amount (in millions) | Weighted-Average Period (in Years)
Nonvested time based RSUs and RSAs | $ | 64 |  | 2.38
Nonvested performance based RSUs and RSAs | 15 |  | 1.44

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