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STOCK-BASED COMPENSATION - Share-based Payment Arrangement, Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Options      
Outstanding at beginning of period (in shares) 39,000,000    
Granted (in shares) 29,000,000    
Exercised (in shares) (1,000,000) 0 0
Forfeited / cancelled (in shares) (2,000,000)    
Outstanding at end of period (in shares) 65,000,000 39,000,000  
Vested and expected to vest (in shares) 65,000,000    
Exercisable (in shares) 22,000,000    
Weighted Average Exercise Price      
Outstanding at beginning of period (in USD per share) $ 12.06 $ 4.19  
Granted (in USD per share) 22.06    
Exercised (in USD per share) 3.29    
Forfeited / cancelled (in USD per share) 4.73    
Outstanding at end of period (in USD per share) 12.06 $ 4.19  
Vested and expected to vest (in USD per share) 12.06    
Exercisable (in USD per share) $ 3.95    
Weighted Average Remaining Contractual Life (Years)      
Outstanding (in years) 7 years 8 months 12 days    
Vested and expected to vest (in years) 7 years 8 months 12 days    
Exercisable (in years) 6 years 7 months 6 days    
Aggregate Intrinsic Value      
Outstanding $ 6,018    
Vested and expected to vest 6,018    
Exercisable $ 2,161    
Shares      
Vested and expected to vest (in shares) 37,000,000    
Exercisable (in shares) 0    
Weighted Average Grant Date Fair Value      
Vested and expected to vest (in USD per share) $ 31.24    
Exercisable (in USD per share) $ 0    
RSUs      
Shares      
Outstanding at beginning of period (in shares) 12,000,000    
Granted (in shares) 26,000,000   0
Exercised (in shares) 0    
Forfeited / cancelled (in shares) (1,000,000)    
Outstanding at end of period (in shares) 37,000,000 12,000,000  
Weighted Average Grant Date Fair Value      
Outstanding at beginning of period (in USD per share) $ 7.24    
Granted (in USD per share) 43.94 $ 7.23  
Exercised (in USD per share) 0    
Forfeited / cancelled (in USD per share) 27.36    
Outstanding at end of period (in USD per share) $ 31.24 $ 7.24