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STOCK-BASED COMPENSATION - Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Stock Options and Stock Appreciation Rights    
Shares Subject to Option (in thousands)    
Beginning balance (in shares) 36,015 36,732
Granted (in shares) 3,921 3,194
Vested/Exercised (in shares) (2,620) (5,934)
Forfeitures/Cancelled (in shares) (584) (1,551)
Ending balance (in shares) 36,732 32,441
Exercisable (in shares)   14,613
Weighted-Average Exercise Price    
Beginning balance (in dollars per share) $ 19.90 $ 19.91
Granted (in dollars per share) 17.57 38.92
Vested/Exercised (in dollars per share) 15.81 17.59
Forfeited/Cancelled (in dollars per share) 22.31 23.98
Ending balance (in dollars per share) $ 19.91 22.02
Exercisable (in dollars per share)   $ 18.96
Aggregate Intrinsic Value (in millions)    
Outstanding   $ 1,046
Exercisable   $ 516
Weighted- Average Remaining Life (in years)    
Outstanding   6 years 3 months 18 days
Exercisable   4 years 3 months 18 days
Restricted Stock    
RSUs / PSUs (in thousands)    
Beginning balance (in shares) 5,622 5,574
Granted (in shares) 523 286
Vested (in shares) 483 2,168
Forfeited/Cancelled (in shares) (88) (122)
Ending balance (in shares) 5,574 3,570
Weighted-Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 21.37 $ 21.57
Granted (in dollars per share) 21.43 46.49
Vested (in dollars per share) 19.74 21.45
Forfeited/Cancelled (in dollars per share) 23.29 25.39
Ending balance (in dollars per share) $ 21.57 $ 23.33
Performance Shares    
RSUs / PSUs (in thousands)    
Beginning balance (in shares) 68 772
Granted (in shares) 728 821
Vested (in shares)   20
Forfeited/Cancelled (in shares) (24) (152)
Ending balance (in shares) 772 1,421
Weighted-Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 21.23 $ 18.46
Granted (in dollars per share) 18.23 41.48
Vested (in dollars per share)   23.72
Forfeited/Cancelled (in dollars per share) 19.25 27.28
Ending balance (in dollars per share) $ 18.46 $ 30.75