Share-Based Payments (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 117,347,000	$ 171,435,000	$ 167,207,000
Subtotal	150,100,000	193,100,000	167,200,000
Capitalized share-based payment costs	(4,500,000)	(3,500,000)	(6,300,000)
Share-based compensation expense included in total costs and expenses	145,600,000	189,600,000	160,900,000
Stock Options [Member]
Summary of share based compensation expense associated with different programs
Share-based compensation expense	5,900,000	26,100,000	21,600,000
Market stock units [Member]
Summary of share based compensation expense associated with different programs
Share-based compensation expense	14,600,000	10,000,000
Time Vested Restricted Stock Units [Member]
Summary of share based compensation expense associated with different programs
Share-based compensation expense	89,600,000	129,400,000	133,700,000
Performance vested restricted stock units settled in shares [Member]
Summary of share based compensation expense associated with different programs
Share-based compensation expense	1,000,000	5,300,000	4,600,000
Cash settled performance shares [Member]
Summary of share based compensation expense associated with different programs
Share-based compensation expense	32,700,000	15,000,000
Employee Stock Purchase Plan [Member]
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 6,300,000	$ 7,300,000	$ 7,300,000