Stock-Based Incentive Plan (Stock Option Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares under option, outstanding at beginning of period	16,616,617
Weighted average exercise price per share, outstanding at beginning of period	$ 19.54
Number of shares under option, options granted	1,891,035
Weighted average exercise price per share, options granted	$ 31.61
Number of shares under option, options exercised	(3,263,711)
Weighted average exercise price per share, options exercised	$ 17.76
Number of shares under option, options forfeited	(591,100)
Weighted average exercise price per share, options forfeited	$ 22.48
Number of shares under option, outstanding at end of period	14,652,841
Weighted average exercise price per share, outstanding at end of period	$ 21.39
Number of shares under option, vested and expected to vest at end of period	13,838,827
Weighted average exercise price per share, vested and expected to vest at end of period	$ 21.18
Number of shares under option, options exercisable at end of period	8,937,942
Weighted average exercise price per share, options exercisable at end of period	$ 18.63