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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2021
Oct. 31, 2021
Jan. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)       29,000,000      
Exercised (in shares)       (1,000,000) 0 0  
Aggregate intrinsic value       $ 127      
Stock options modified (in shares)   5,000,000          
Unrecognized compensation costs   $ 275          
Stock Plan 2015              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares reserved for issuance (in shares)       101,000,000      
Stock Plan 2021              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares reserved for issuance (in shares)       99,000,000      
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        
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      
Weighted average grant date fair value (in USD per share)       $ 10.03 $ 2.28 $ 1.26  
Unrecognized compensation expense       $ 1,491      
Unrecognized compensation expense period for recognition (in years)       3 years 9 months 18 days      
Stock Options | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Contractual term (in years)       7 years      
Stock Options | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Contractual term (in years)       10 years      
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      
Modified shares outstanding (in shares)       37,000,000 12,000,000   17,000,000
Granted (in shares)       26,000,000   0  
Granted (in USD per share)       $ 43.94 $ 7.23    
Unrecognized compensation expense             $ 322
Employee Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares reserved for issuance (in shares) 22,000,000     22,000,000      
Unrecognized compensation expense       $ 46      
Employee discount (as a percent) 15.00%            
Share based payment award percentage of outstanding shares 1.00%            
Employee Stock | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares reserved for issuance (in shares) 185,000,000