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STOCK-BASED EMPLOYEE COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 6 $ 74
Performance Shares [Member] | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate grant-date fair values $ 265  
Restricted Stock Units (RSUs) [Member] | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 1 year  
Restricted Stock Units (RSUs) [Member] | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Restricted Stock Units and Performance Share Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate fair value of performance share units and restricted stock units vested during the period $ 319  
Total unrecognized estimated compensation expense, unvested share-based awards $ 541  
Total future compensation cost related to unvested share-based awards, expected period of recognition 2 years 3 months 18 days  
Adjustment for change in estimated probable outcome at the end of the performance period [Member] | Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 73