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SHARE-BASED COMPENSATION - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs)
shares in Millions
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Shares  
Unvested beginning balance (in shares) | shares 2.0
Granted (in shares) | shares 0.7
Vested (in shares) | shares (0.7)
Forfeited (in shares) | shares (0.1)
Unvested ending balance (in shares) | shares 1.9
Weighted Average Grant Date Fair Value  
Unvested beginning balance (usd per share) | $ / shares $ 295.70
Granted (usd per share) | $ / shares 543.83
Vested (usd per share) | $ / shares 251.74
Forfeited (usd per share) | $ / shares 365.99
Unvested ending balance (usd per share) | $ / shares $ 399.74