Share-Based Employee Compensation Plans and Other Compensation and Benefit Plans (Summary Of Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Stock Option [Member]
Outstanding at December 31, 2010, shares	8,255
Outstanding at December 31, 2010, weighted-average exercise price	30.37
Granted, shares	1,672
Granted, weighted-average exercise price	63.15
Exercised, shares	(1,818)
Exercised, weighted-average exercise price	26.97
Forfeited, shares	(716)
Forfeited, weighted-average exercise price	42.96
Outstanding at December 31, 2011, shares	7,393
Outstanding at December 31, 2011, weighted-average exercise price	37.41
Outstanding at December 31, 2011, average remaining contractual term, in years	6.68
Outstanding at December 31, 2011, aggregate intrinsic value	314,531
Vested or expected to vest at December 31, 2011, shares	6,876
Vested or expected to vest at December 31, 2011, weighted-average exercise price	36.35
Vested or expected to vest at December 31, 2011, average remaining contractual term, in years	6.54
Vested or expected to vest at December 31, 2011, aggregate intrinsic value	299,798
Exercisable at December 31, 2011, shares	3,878
Exercisable at December 31, 2011, weighted-average exercise price	27.51
Exercisable at December 31, 2011, average remaining contractual term, in years	5.15
Exercisable at December 31, 2011, aggregate intrinsic value	203,379
Stock Option [Member]
Exercisable at December 31, 2011, average remaining contractual term, in years	5.12	5.21	5.21
Director [Member] | Stock Option [Member]
Outstanding at December 31, 2010, shares	140
Outstanding at December 31, 2010, weighted-average exercise price	33.43
Granted, shares	0
Granted, weighted-average exercise price	0.00
Exercised, shares	(43)
Exercised, weighted-average exercise price	29.85
Forfeited, shares	0
Forfeited, weighted-average exercise price	0.00
Outstanding at December 31, 2011, shares	97
Outstanding at December 31, 2011, weighted-average exercise price	35.00
Outstanding at December 31, 2011, average remaining contractual term, in years	3.77
Outstanding at December 31, 2011, aggregate intrinsic value	4,383
Vested or expected to vest at December 31, 2011, shares	97
Vested or expected to vest at December 31, 2011, weighted-average exercise price	35.00
Vested or expected to vest at December 31, 2011, average remaining contractual term, in years	3.77
Vested or expected to vest at December 31, 2011, aggregate intrinsic value	4,383
Exercisable at December 31, 2011, shares	97
Exercisable at December 31, 2011, weighted-average exercise price	35.00
Exercisable at December 31, 2011, average remaining contractual term, in years	3.77
Exercisable at December 31, 2011, aggregate intrinsic value	4,383