COMMON STOCK - Schedule of Stock Option and Restricted Stock Unit Activity (Details) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) $ / shares shares
Stock option activity
Shares
Beginning balance (in shares)	8,700,000
Options granted (in shares)	900,000
Options exercised (in shares)	(2,300,000)
Options forfeited (in shares)	(100,000)
Ending balance (in shares)	7,200,000
Exercisable as of period end (in shares)	5,000,000
Vested and expected to vest as of period end (in shares)	6,900,000
Weighted- Average Exercise Price
Beginning balance (in dollars per share) \| $ / shares	$ 59.86
Options granted (in dollars per share) \| $ / shares	136.77
Options exercised (in dollars per share) \| $ / shares	45.41
Options forfeited (in dollars per share) \| $ / shares	97.57
Ending balance (in dollars per share) \| $ / shares	73.42
Exercisable as of period end (in dollars per share) \| $ / shares	55.63
Vested and expected to vest as of period end (in dollars per share) \| $ / shares	$ 71.60
Weighted- Average Remaining Contractual Term
Outstanding as of period end	3 years 4 months 24 days
Exercisable as of period end	2 years 6 months
Vested and expected to vest as of period end	3 years 3 months 19 days
Aggregate Intrinsic Value
Outstanding as of period end \| $	$ 576.3
Exercisable as of period end \| $	489.3
Vested and expected to vest as of period end \| $	$ 564.1
Nonvested restricted stock unit activity
Shares
Beginning balance (in shares)	1,200,000
Granted (in shares)	400,000
Vested (in shares)	(500,000)
Forfeited (in shares)	(100,000)
Ending balance (in shares)	1,000,000
Weighted- Average Grant-Date Fair Value
Beginning balance (in dollars per share) \| $ / shares	$ 85.23
Granted (in dollars per share) \| $ / shares	130.29
Vested (in dollars per share) \| $ / shares	59.41
Forfeited (in dollars per share) \| $ / shares	92.64
Ending balance (in dollars per share) \| $ / shares	$ 113.86
MRSUs
Shares
Granted (in shares)	42,025
Weighted- Average Grant-Date Fair Value
Shares related to previous year's grant (in shares)	50,120

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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