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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate grant-date fair value of performance share units and restricted stock units granted during the period | $ 13 | $ 463 |
Aggregate fair value of performance share units and restricted stock units vested during the period | 12 | 375 |
Performance Share Units | 2018 and 2019 Grants | Executive Officers |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional stock-based compensation expense as a result of the modification to be recognized over the remaining requisite service period |  |  | $ 40
Restricted Stock Units and Performance Share Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized estimated compensation expense, unvested share-based awards | 725 | $ 725 |
Total future compensation cost related to unvested share-based awards, expected period of recognition |  | 2 years 1 month 6 days |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized estimated compensation expense, unvested share-based awards | $ 14 | $ 14 |
Total future compensation cost related to unvested share-based awards, expected period of recognition |  | 8 months 12 days |

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