Equity Based Compensation (Details) (USD $)					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2010 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance					3,106,880,000	3,382,316,000	3,200,639,000	755,666,000	701,542,000	556,216,000
Granted					685,331,000	503,259,000	535,867,000	257,679,000	222,580,000	253,342,000
Exercised / Lapsed					(287,485,000)	(736,452,000)	(314,815,000)	(282,035,000)	(146,638,000)	(93,597,000)
Forfeited					(50,331,000)	(42,243,000)	(39,375,000)	(25,980,000)	(21,818,000)	(14,419,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance					3,454,395,000	3,106,880,000	3,382,316,000	705,330,000	755,666,000	701,542,000
Options exercisable					2,279,783,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period	$ 49.63	$ 46.30	$ 41.91	$ 39.96
Granted	$ 56.65	$ 59.74	$ 47.10
Exercised / Lapsed	$ 29.96	$ 35.26	$ 30.80
Forfeited	$ 52.89	$ 45.50	$ 43.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period	$ 49.63	$ 46.30	$ 41.91	$ 39.96
Options exercisable	$ 48.59
Options, Outstanding, Intrinsic Value	$ 13,500,000
Options, Exercisable, Intrinsic Value	$ 11,200,000