Equity Based Compensation (Details 1) (USD $)	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	3,454,395,000
Options Outstanding, Weighted-Average Remaining Contractual Life	6.2
Options Oustanding, Weighted Average Exercise Price	$ 49.63
Options Exercisable	2,279,783,000
Options Exercisable, Weighted-Average Exercise Price	$ 48.59
Range Of Exercise Prices 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	635,041,000
Options Outstanding, Weighted-Average Remaining Contractual Life	6.0
Options Oustanding, Weighted Average Exercise Price	$ 32.18
Options Exercisable	461,326,000
Options Exercisable, Weighted-Average Exercise Price	$ 32.17
Range Of Exercise Prices 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	141,750,000
Options Outstanding, Weighted-Average Remaining Contractual Life	1.0
Options Oustanding, Weighted Average Exercise Price	$ 39.61
Options Exercisable	141,750,000
Options Exercisable, Weighted-Average Exercise Price	$ 39.61
Range Of Exercise Prices 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	891,253,000
Options Outstanding, Weighted-Average Remaining Contractual Life	5.0
Options Oustanding, Weighted Average Exercise Price	$ 47.26
Options Exercisable	638,286,000
Options Exercisable, Weighted-Average Exercise Price	$ 47.32
Range Of Exercise Prices 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	1,786,351,000
Options Outstanding, Weighted-Average Remaining Contractual Life	7.2
Options Oustanding, Weighted Average Exercise Price	$ 57.80
Options Exercisable	1,038,421,000
Options Exercisable, Weighted-Average Exercise Price	$ 57.89