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STOCK-BASED COMPENSATION. (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Rollforward of stock options

The following table summarizes the status of, and changes in, our stock options during 2018.

	Options			Weighted- average exercise price				Weighted-average remaining contractual term in years
Outstanding at December 31, 2017	15,221,123			$	66.98
Exercised	(3,831,062	)		$	60.68
Forfeited	(73,416	)		$	76.08
Expired	(16,252	)		$	71.99
Outstanding at December 31, 2018	11,300,393			$	69.05			4.5
Exercisable at December 31, 2018	9,251,542			$	67.39			4.1

Rollforward of nonvested restricted shares and restricted stock units

The following table summarizes the status of, and changes in, our nonvested restricted shares and restricted stock units during 2018.

	Restricted shares			Restricted stock units			Weighted- average fair value
Nonvested at December 31, 2017	473,115			5,556,911			$	82.37
Time-based grants	8,775			2,438,198			$	92.37
Performance-based grants	—			160,821			$	92.03
Vested (value at vest date was $160.9 million)	(330,920	)		(1,412,089	)		$	79.32
Forfeited	(14,006	)		(139,921	)		$	79.74
Nonvested at December 31, 2018	136,964			6,603,920			$	87.07

Future stock-based compensation expense

The following table presents the compensation expense to be recognized over the remaining vesting periods of the stock-based awards outstanding at December 31, 2018. Estimated future compensation expense will change to reflect future grants, changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.

(in millions)
First quarter 2019	$	51.4
Second quarter 2019	50.6
Third quarter 2019	50.5
Fourth quarter 2019	45.2
Total 2019	197.7
2020 through 2024	188.6
Total	$	386.3

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized.

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