Stock-Based Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2013

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

Stock Option Activity

The following table summarizes stock option activity:

	Number of Shares Under Option		Weighted Average Exercise Price per Share
Outstanding at December 31, 2010	23,840,049		$	15.99
Options granted	4,943,178		22.40
Options exercised	(4,514,170	)	15.09
Options forfeited	(669,801	)	19.05
Outstanding at December 31, 2011	23,599,256		$	17.42
Options granted	3,130,843		23.37
Options exercised	(9,360,396	)	15.40
Options forfeited	(753,086	)	20.24
Outstanding at December 31, 2012	16,616,617		$	19.54
Options granted	2,182,035		32.92
Options exercised	(4,367,871	)	17.80
Options forfeited	(866,900	)	23.12
Outstanding at December 31, 2013	13,563,881		$	22.05
Vested and expected to vest at December 31, 2013	12,769,967		$	21.80
Options exercisable at December 31, 2013	8,005,682		$	18.82

Status of Company's Nonvested Restricted Stock and Restricted Stock Unit Awards and Changes

A summary of the status of the Company’s nonvested restricted stock and restricted stock unit awards, including performance based restricted stock, as of December 31, 2013 and the changes during the year ended December 31, 2013 are presented below:

	Number of Restricted Stock Awards		Weighted  Average Grant-Date Fair Value Per Share
Nonvested at December 31, 2012	2,498,316		$	22.47
Granted	1,862,236		30.98
Released	(819,797	)	21.81
Forfeited	(218,919	)	26.78
Nonvested at December 31, 2013	3,321,836		$	27.13

Stock-Based Compensation Plans, Valuation Assumptions

The assumptions used are as follows:

	Year Ended December 31,
	2013	2012	2011
Volatility	23.9%	29.7%	33.0%
Risk-free interest rate	1.1%	1.0%	2.4%
Expected term of options (years)	6.1	5.9	6.0
Forfeiture rate	5.5%	5.5%	5.5%
Weighted average grant date fair value per option	$8.49	$7.00	$8.13