Employee Benefit Plans (Options Outstanding And Exercisable) (Details) (USD $)							12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 Options Outstanding [Member]	Dec. 31, 2010 Options Outstanding [Member]	Dec. 31, 2009 Options Outstanding [Member]	Dec. 31, 2008 Options Outstanding [Member]	Dec. 31, 2011 Options Exercisable [Member]	Dec. 31, 2011 $ 45.01 - $ 50.00 [Member]	Dec. 31, 2011 $ 45.01 - $ 50.00 [Member] Options Outstanding [Member]	Dec. 31, 2011 $ 45.01 - $ 50.00 [Member] Options Exercisable [Member]	Dec. 31, 2011 50.01 - 55.00 [Member]	Dec. 31, 2011 50.01 - 55.00 [Member] Options Outstanding [Member]	Dec. 31, 2011 50.01 - 55.00 [Member] Options Exercisable [Member]	Dec. 31, 2011 55.01 - 60.00 [Member]	Dec. 31, 2011 55.01 - 60.00 [Member] Options Outstanding [Member]	Dec. 31, 2011 55.01 - 60.00 [Member] Options Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum							$ 45.01			$ 50.01			$ 55.01
Range of Exercise Prices, Maximum							$ 50.00			$ 55.00			$ 60.00
Number of Shares, Options Outstanding		4,968,822	4,383,885	4,600,455	4,272,050			1,472,890			2,779,957			715,975
Weighted-Average Exercise Price, Options Outstanding		$ 51.49	$ 52.08	$ 51.18	$ 49.98			$ 48.39			$ 51.52			$ 57.71
Weighted-Average Remaining Contractual Life in Years, Options Outstanding	2.7	6.96						7.99			6.99			4.75
Number of Shares, Option Exercisable						3,062,804			673,500			1,677,454			711,850
Weighted-Average Exercise Price, Option Exercisable						$ 52.25			$ 48.85			$ 51.30			$ 57.70