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STOCK-BASED COMPENSATION. (Stock Options) (Details) - $ / shares	6 Months Ended
	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)	7,388,068
Exercised (in shares)	(1,944,942)
Forfeited (in shares)	(5,457)
Outstanding, ending balance (in shares)	5,437,669
Exercisable at current period-end (in shares)	4,772,891
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price of options outstanding, beginning balance (in dollars per share)	$ 71.06
Weighted-average exercise price of options exercised (in dollars per share)	68.29
Weighted-average exercise price of options forfeited (in dollars per share)	74.09
Weighted-average exercise price of options outstanding, ending balance (in dollars per share)	72.05
Weighted-average exercise price of options exercisable at current period-end (in dollars per share)	$ 71.52

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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-SubTopic 10
-Section 50
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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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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 that were terminated.

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

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