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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Stock based compensation expense | Total share-based compensation expense is reported in “General and administrative expenses” in the accompanying consolidated statements of income, and summarized below.
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
| (In millions)
| Pretax Charges |  | Net-of-Tax Amount |  | Pretax Charges |  | Net-of-Tax Amount |  | Pretax Charges |  | Net-of-Tax Amount
RSAs, PSAs and PSUs (defined below) | $ | 66 |  |  | $ | 62 |  |  | $ | 47 |  |  | $ | 44 |  |  | $ | 29 |  |  | $ | 28 |
Employee stock purchase plan and stock options | 6 |  |  | 6 |  |  | 10 |  |  | 9 |  |  | 10 |  |  | 9 |
Total | $ | 72 |  |  | $ | 68 |  |  | $ | 57 |  |  | $ | 53 |  |  | $ | 39 |  |  | $ | 37 |
Restricted and performance stock activity | Activity for stock-based awards in the year ended December 31, 2021, is summarized below.
| RSAs |  | Weighted Average Grant Date Fair Value |  | PSUs |  | Weighted Average Grant Date Fair Value
Unvested balance, December 31, 2020 | 585,084 |  |  | $ | 118.07 |  |  | 471,909 |  |  | $ | 111.04 |
Granted | 289,227 |  |  | 224.63 |  |  | 160,670 |  |  | 74.52 |
Vested | (232,896) |  |  | 112.62 |  |  | (321,340) |  |  | 74.52 |
Forfeited | (102,298) |  |  | 161.36 |  |  | (36,189) |  |  | 129.19 |
Unvested balance, December 31, 2021 | 539,117 |  |  | $ | 169.39 |  |  | 275,050 |  |  | $ | 129.99 |
Stock options, activity | The total grant date fair value of awards granted and vested is presented in the following table.
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
| (In millions)
Granted: |  |  |  |  |
RSAs | $ | 65 |  |  | $ | 44 |  |  | $ | 33 |
PSUs | — |  |  | 23 |  |  | 20 |
Total granted | $ | 65 |  |  | $ | 67 |  |  | $ | 53 |
Vested: |  |  |  |  |
RSAs | $ | 53 |  |  | $ | 22 |  |  | $ | 19 |
PSUs | 71 |  |  | 1 |  |  | 2 |
Total vested | $ | 124 |  |  | $ | 23 |  |  | $ | 21 |
Stock Options. Stock option awards generally have an exercise price equal to the fair market value of our common stock on the date of grant, vest in equal annual installments over periods up to four years from the date of grant, and have a maximum term of ten years from the date of grant. Stock option activity for the year ended December 31, 2021, is summarized below.
| Number of Shares |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted Average Remaining Contractual term
|  |  | (Per share) |  | (In millions) |  | (Years)
Stock options outstanding as of December 31, 2020 | 405,000 |  |  | $ | 64.79 |  |  |  |  |
Exercised | (10,000) |  |  | 33.02 |  |  |  |  |
Stock options outstanding, vested, and exercisable as of December 31, 2021 | 395,000 |  |  | 65.59 |  |  | $ | 100 |  |  | 5.5

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