Stock-Based Incentive Plan (Stock Option Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding number of shares under option, beginning of period	23,599,256
Outstanding weighted average exercise price per share, beginning of period	$ 17.42
Options granted, number of shares under option	2,749,843
Options granted, weighted average exercise price per share	$ 22.97
Options exercised, number of shares under option	(3,482,848)
Options exercised, weighted average exercise price per share	$ 15.07
Options forfeited, number of shares under option	(635,313)
Options forfeited, weighted average exercise price per share	$ 20.24
Outstanding number of shares under option, end of period	22,230,938
Outstanding weighted average exercise price per share, end of period	$ 18.39
Vested and expected to vest number of shares under option, end of period	21,237,047
Vested and expected to vest weighted average exercise price per share, end of period	$ 18.25
Options exercisable number of shares under option, end of period	15,107,043
Options exercisable weighted average exercise price per share, end of period	$ 16.80