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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Additional Information on RSUs | The following table provides additional information on RSUs, including PSUs, for the last three fiscal years:
| 2021 |  | 2020 |  | 2019
Stock-based compensation expense (in millions) | $ | 171 |  |  | $ | 188 |  |  | $ | 177 |
Weighted average grant-date fair value (per unit) | $ | 141 |  |  | $ | 101 |  |  | $ | 117 |
Aggregate intrinsic value of distributed RSUs (in millions) | $ | 205 |  |  | $ | 234 |  |  | $ | 276 |
Changes in Outstanding RSU Grants | The following table presents the changes in our outstanding RSUs, including PSUs, during 2021 and the associated weighted average grant-date fair values:
| Number of RSUs (in millions) |  | Weighted Average Grant-Date Fair Value (per unit)
Outstanding at year-end 2020 | 5.8 |  |  | $ | 107 |
Granted | 0.5 |  |  | $ | 141 |
Distributed | (1.7) |  |  | $ | 113 |
Forfeited | (0.2) |  |  | $ | 106 |
Outstanding at year-end 2021 | 4.4 |  |  | $ | 109 |

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