Stock-Based Incentive Plan (Stock Awards) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares under stock awards, outstanding at beginning of period	13,563,881
Weighted average exercise price per share, outstanding at beginning of period	$ 22.05
Number of shares under stock awards, granted	5,350,684
Weighted average exercise price per share, granted	$ 52.84
Number of shares under stock awards, exercised	(1,133,171)
Weighted average exercise price per share, exercised	$ 19.62
Number of shares under stock awards, forfeited	(167,209)
Weighted average exercise price per share, forfeited	$ 26.72
Number of shares under stock awards, outstanding at end of period	17,614,185
Weighted average exercise price per share, outstanding at end of period	$ 31.54
Number of shares under stock awards, vested and expected to vest at end of period	16,933,782
Weighted average exercise price per share, vested and expected to vest at end of period	$ 31.55
Number of shares under stock awards, options exercisable at end of period	8,592,857
Weighted average exercise price per share, options exercisable at end of period	$ 19.85