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STOCK-BASED COMPENSATION. (Stock Options) (Details) - $ / shares	6 Months Ended
	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2018 (in shares)	11,300,393
Exercised (in shares)	(1,765,404)
Forfeited (in shares)	(86,456)
Expired (in shares)	(7,809)
Outstanding at June 30, 2019 (in shares)	9,440,724
Exercisable at June 30, 2019 (in shares)	7,485,674
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price of options outstanding at December 31, 2018 (in dollars per share)	$ 69.05
Weighted-average exercise price of options exercised (in dollars per share)	62.39
Weighted-average exercise price of options forfeited (in dollars per share)	76.68
Weighted-average exercise price of options expired (in dollars per share)	59.07
Weighted-average exercise price of options outstanding at June 30, 2019 (in dollars per share)	70.23
Weighted-average exercise price of options exercisable at June 30, 2019 (in dollars per share)	$ 68.59

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Number of share options (or share units) exercised during the current period.

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