Severance (Details) (USD $)	1 Months Ended		3 Months Ended
	Nov. 30, 2011	Aug. 31, 2011	Mar. 31, 2012
Severance [Abstract]
Number of employees that accepted the termination benefits	500
Number of eligible employees		4,850
Severance Liability, beginning balance			$ 32,000,000
Provision/Adjustments			(1,000,000)
Cash Reductions			(3,000,000)
Severance Liability, ending balance			28,000,000
Severance expense			$ 80,000,000