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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
1 Months Ended 9 Months Ended
Jan. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for issuance (in shares)   114,000,000    
Compensation expense   $ 0    
Chief Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite period (in years) 6 years      
Granted (in shares) 27,000,000      
Value of options granted $ 241,000,000      
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite period (in years)   4 years    
Vesting period (in years)   4 years    
Vested (in shares)   0    
Unrecognized compensation expense   $ 1,389,000,000    
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite period (in years)   4 years    
Vesting period (in years)   4 years    
Vested (in shares)   0    
Unrecognized compensation expense     $ 322,000,000  
Modified shares outstanding (in shares)   32,000,000 17,000,000 7,000,000