STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2015

Summary of option activity

	Stock Awards Plans					Director Stock Option Plans
			Weighted Average				Weighted Average
		Options	Exercise Price			Options	Exercise Price
Outstanding, January 1, 2015		8,107,806	$	46.74		368,668	$	53.52
Granted		1,391,355		64.60		—		—
Exercised		(1,416,507)		37.15		(65,167)		41.93
Forfeited or expired		(50,624)		60.84		—		—
Outstanding at December 31, 2015		8,032,030	$	51.44		303,501	$	56.00
Exercisable at December 31, 2015		5,324,545	$	45.23		221,159	$	53.22
Weighted-Average Remaining Contractual Term (Years):
Outstanding at December 31, 2015		6.1				6.8
Exercisable at December 31, 2015		4.9				6.4
Aggregate Intrinsic Value:
Outstanding at December 31, 2015	$	170,340			$	5,052
Exercisable at December 31, 2015	$	145,978			$	4,297
Intrinsic Value of Options Exercised During the Years Ended:
December 31, 2015	$	43,041			$	1,478
December 31, 2014	$	33,059			$	741
December 31, 2013	$	37,822			$	732

Summary of restricted stock unit activity

				Director Restricted
	Stock Awards Plans			Stock Unit Plan
		Weighted Average			Weighted Average
	RSUs	Grant‑Date Fair Value		RSUs	Grant-Date Fair Value
Nonvested at January 1,  2015	61,750	$	64.09	—	$	—
Granted	17,957		67.96	18,857		63.10
Vested	(13,331)		56.75	—		—
Nonvested at December 31, 2015	66,376	$	66.61	18,857	$	63.10

Stock Option Plans

Weighted-average assumptions used to estimate fair value of stock options granted

Stock Awards Plans:	2015		2014		2013
Years ended December 31,
Dividend Yield	1.7	%	1.7	%	1.8	%
Expected Stock Price Volatility	21.9	%	22.2	%	22.7	%
Risk-free Interest Rate	1.6	%	2.3	%	1.3	%
Expected Life of Option (years)	6.9		6.9		6.9

Director Stock Option Plans

Weighted-average assumptions used to estimate fair value of stock options granted

Director Stock Option Plans:
Years ended December 31,	2014		2013
Dividend Yield	1.8	%	1.9	%
Expected Stock Price Volatility	22.2	%	23.0	%
Risk-free Interest Rate	2.2	%	1.3	%
Expected Life of Option (years)	6.9		6.9