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SHARE-BASED COMPENSATION - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs)
shares in Millions
3 Months Ended
Mar. 31, 2022
$ / shares
shares
Shares  
Unvested beginning balance (in shares) | shares 4.8
Granted (in shares) | shares 1.5
Vested (in shares) | shares (1.6)
Forfeited (in shares) | shares (0.1)
Unvested ending balance (in shares) | shares 4.6
Weighted-Average Grant-Date Fair Value  
Unvested beginning balance (usd per share) | $ / shares $ 207.37
Granted (usd per share) | $ / shares 290.84
Vested (usd per share) | $ / shares 186.75
Forfeited (usd per share) | $ / shares 223.75
Unvested ending balance (usd per share) | $ / shares $ 241.94