Stock-Based Compensation (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2011 Y
Information about stock options outstanding
Low end of exercise price range (in dollars per share)	$ 7.95
High end of exercise price range (in dollars per share)	$ 61.82
Outstanding options
Number outstanding (in shares)	11,608,029
Weighted-average remaining contractual life (in years)	4.53
Weighted-average exercise price (in dollars per share)	$ 30.00
Exercisable options
Number outstanding (in shares)	7,490,154
Weighted-average exercise price (in dollars per share)	$ 30.26
Exercise Price Range $7.95 to $29.22
Information about stock options outstanding
Low end of exercise price range (in dollars per share)	$ 7.95
High end of exercise price range (in dollars per share)	$ 29.22
Outstanding options
Number outstanding (in shares)	5,559,390
Weighted-average remaining contractual life (in years)	3.75
Weighted-average exercise price (in dollars per share)	$ 24.66
Exercisable options
Number outstanding (in shares)	3,457,765
Weighted-average exercise price (in dollars per share)	$ 24.48
Exercise Price Range $29.34 to $35.15
Information about stock options outstanding
Low end of exercise price range (in dollars per share)	$ 29.34
High end of exercise price range (in dollars per share)	$ 35.15
Outstanding options
Number outstanding (in shares)	4,484,390
Weighted-average remaining contractual life (in years)	5.30
Weighted-average exercise price (in dollars per share)	$ 32.63
Exercisable options
Number outstanding (in shares)	2,628,140
Weighted-average exercise price (in dollars per share)	$ 31.68
Exercise Price Range $35.75 to $61.82
Information about stock options outstanding
Low end of exercise price range (in dollars per share)	$ 35.75
High end of exercise price range (in dollars per share)	$ 61.82
Outstanding options
Number outstanding (in shares)	1,564,249
Weighted-average remaining contractual life (in years)	5.13
Weighted-average exercise price (in dollars per share)	$ 41.48
Exercisable options
Number outstanding (in shares)	1,404,249
Weighted-average exercise price (in dollars per share)	$ 41.82