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STOCK-BASED EMPLOYEE COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate grant-date fair value $ 368    
Aggregate fair value of performance share units and restricted stock units vested during the period 353    
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 $ 715    
Total future compensation cost related to unvested share-based awards, expected period of recognition 2 years 3 months 18 days    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized estimated compensation expense, unvested share-based awards $ 47    
Total future compensation cost related to unvested share-based awards, expected period of recognition 1 year 10 months 24 days