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STOCK-BASED EMPLOYEE COMPENSATION - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 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 | $ 22 |  |  |  | $ 400
Aggregate fair value of performance share units and restricted stock units vested during the period | 8 |  |  |  | 385
Performance Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense, reduction in expense for estimated probable outcome |  |  |  | $ 73 |
Performance Share Units | 2018 Grants |  |  |  |  |
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 |  |  | $ 11 |  |
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 | 520 |  |  |  | $ 520
Total future compensation cost related to unvested share-based awards, expected period of recognition |  |  |  |  | 2 years
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total unrecognized estimated compensation expense, unvested share-based awards | $ 33 |  |  |  | $ 33
Total future compensation cost related to unvested share-based awards, expected period of recognition |  |  |  |  | 1 year 4 months 24 days

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