Share-Based Payments (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 123,956,000	$ 117,347,000	$ 171,435,000
Subtotal	184,300,000	150,100,000	193,100,000
Capitalized share-based compensation costs	(5,400,000)	(4,500,000)	(3,500,000)
Share-based compensation expense included in total costs and expenses	178,900,000	145,600,000	189,600,000
Stock options
Summary of share based compensation expense associated with different programs
Share-based compensation expense	2,300,000	5,900,000	26,100,000
Market stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	23,300,000	14,600,000	10,000,000
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	93,000,000	89,600,000	129,400,000
Performance-vested restricted stock units settled in shares [Member]
Summary of share based compensation expense associated with different programs
Share-based compensation expense	100,000	1,000,000	5,300,000
Cash settled performance shares
Summary of share based compensation expense associated with different programs
Share-based compensation expense	60,400,000	32,700,000	15,000,000
Employee stock purchase plan
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 5,200,000	$ 6,300,000	$ 7,300,000