Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2015

The assumptions used are shown in the following table.



	2015		2014		2013
Weighted average expected term	6.5 years		6.5 years		8.2 years
Expected volatility	16.0 - 37.8%		16.8 - 42.2%		19.1 - 48.1%
Weighted average volatility	24.7	%	28.3	%	31.0	%
Expected dividends	1.6 - 2.1%		1.7 - 2.2%		1.9 - 2.2%
Weighted average expected dividends	1.7	%	2.1	%	2.2	%
Risk-free rate	0.0 - 2.4%		0.0 - 3.0%		0.0 - 2.9%

A summary of option activity for the year ended December 31, 2015 is shown in the following table.



	Number (in 000s)		Weighted average exercise price		Aggregate intrinsic value (in 000s)		Weighted average remaining contractual term (years)
Outstanding as of January 1, 2015	17,989		$	42.05
Granted	2,264		70.26
Exercised	(4,375	)	42.71
Forfeited	(156	)	54.58
Expired	(6	)	54.31
Outstanding as of December 31, 2015	15,716		45.81		$	274,191	5.5
Outstanding, net of expected forfeitures	15,601		45.68		273,702		5.5
Outstanding, exercisable (“vested”)	10,097		40.62		217,292		4.1

The changes in restricted stock units are shown in the following table for the year ended December 31, 2015.



	Number (in 000s)		Weighted average grant date fair value
Nonvested as of January 1, 2015	2,280		$	42.71
Granted	579		69.25
Vested	(891	)	37.36
Forfeited	(129	)	54.00
Nonvested as of December 31, 2015	1,839		52.86

The changes in performance stock awards are shown in the following table for the year ended December 31, 2015.



	Number (in 000s)		Weighted average grant date fair value
Nonvested as of January 1, 2015	1,304		$	39.70
Granted	229		70.37
Adjustment for performance achievement	199		36.96
Vested	(802	)	32.05
Nonvested as of December 31, 2015	930		53.27