Subsequent Events Subsequent Events (Details) (Sale to TPG Capital, L.P. [Member], USD $)	Jul. 14, 2012
Subsequent Event [Line Items]
Liquidation Amount	$ 1,900,000,000
Minimum [Member]
Subsequent Event [Line Items]
Liquidation Termination Fee	24,000,000
Maximum [Member]
Subsequent Event [Line Items]
Liquidation Termination Fee	48,000,000
Liquidation Reimbursable Expenses	$ 7,000,000