Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Share-based Compensation [Abstract]

Schedule of weighted-average fair value of options, assumptions used

The weighted-average fair value of options granted was estimated at $10.95, $7.39 and $7.89, in 2016, 2015 and 2014, respectively, per option on the date of grant based on the following assumptions:

	Year Ended December 31
	2016		2015		2014
Dividend yield	3.1	%	3.5	%	3.5	%
Volatility	16.0	%	13.4	%	13.4	%
Risk-free interest rate	1.2	%	1.5	%	1.7	%
Expected life - years	4.6		4.8		5.0

Schedule of total remaining unrecognized compensation costs and amortization period

Total remaining unrecognized compensation costs and amortization period are as follows:

	December 31, 2016		Weighted-Average Service Years
Nonvested stock options	$	10	1.4
Restricted shares and time-vested restricted share units	6		1.5
Nonvested performance-based restricted share units	53		1.8

Summary of stock-based compensation

A summary of stock-based compensation is presented below:

Stock Options	Shares (in thousands)		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2016	6,590		$	92.35
Granted	1,627		126.17
Exercised	(1,249	)	85.75
Forfeited or expired	(175	)	112.24
Outstanding at December 31, 2016	6,793		101.16		6.62	$	107
Exercisable at December 31, 2016	3,667		86.87		4.86	$	100

Summary of nonvested restricted share units

	Time-Vested Restricted Share Units				Performance-Based Restricted Share Units
Other Stock-Based Awards	Shares (in thousands)		Weighted- Average Grant-Date Fair Value		Shares (in thousands)		Weighted- Average Grant-Date Fair Value
Nonvested at January 1, 2016	102		$	108.91	1,761		$	107.51
Granted	75		120.96		625		126.05
Vested	(61	)	107.17		(646	)	101.17
Forfeited	(5	)	116.53		(98	)	113.41
Nonvested at December 31, 2016	111		117.63		1,642		116.53