Stock-Based Incentive Plan (Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-Based Incentive Plan [Abstract]
Outstanding, Number of Shares Under Option	23,840,049	26,268,678	23,423,041
Outstanding, Weighted Average Exercise Price per Share	$ 15.99	$ 15.22	$ 15.32
Options granted, Number of Shares Under Option	4,943,178	2,575,039	5,426,354
Options granted, Weighted Average Exercise Price per Share	$ 22.40	$ 20.47	$ 13.74
Options exercised, Number of Shares Under Option	(4,514,170)	(3,900,514)	(1,354,218)
Options exercised, Weighted Average Exercise Price per Share	$ 15.09	$ 14.03	$ 11.59
Options forfeited, Number of Shares Under Option	(669,801)	(1,103,154)	(1,226,499)
Options forfeited, Weighted Average Exercise Price per Share	$ 19.05	$ 15.09	$ 14.50
Outstanding, Number of Shares Under Option	23,599,256	23,840,049	26,268,678
Outstanding, Weighted Average Exercise Price per Share	$ 17.42	$ 15.99	$ 15.22
Vested and expected to vest at December 31, 2011, Number of Shares Under Option	22,503,933
Vested and expected to vest at December 31, 2011, Weighted Average Exercise Price per Share	$ 17.32
Options exercisable at December 31, 2011, Number of Shares Under Option	15,584,220
Options exercisable, Weighted Average Exercise Price per Share	$ 16.05