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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