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SHARE-BASED COMPENSATION - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs)
shares in Millions
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Shares  
Unvested beginning balance (in shares) | shares 5.3
Granted (in shares) | shares 1.9
Vested (in shares) | shares (2.1)
Forfeited (in shares) | shares (0.3)
Unvested ending balance (in shares) | shares 4.8
Weighted Average Grant Date Fair Value  
Unvested beginning balance (USD per share) | $ / shares $ 163.30
Granted (USD per share) | $ / shares 252.42
Vested (USD per share) | $ / shares 144.04
Forfeited (USD per share) | $ / shares 191.29
Unvested ending balance (USD per share) | $ / shares $ 204.31