Debt (Details Textuals 1) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2010	Jun. 30, 2011	Dec. 31, 2010
Debt (Textuals) [Abstract]
Repayment amount of remaining First Lien Credit Facility term loans		$ 1,200,000,000	$ 3,500,000,000
First Lien Credit Facility debt extinguishment costs		19,000,000
2023 First Lien Notes deferred financing costs		22,000,000
Repayment of Project Debt		340,000,000
Term loan interest rate spread option Federal Funds effective rate		0.50%
Term loan interest rate spread option Prime Rate		2.25%
Term Loan interest rate based on LIBOR		3.25%
Term Loan interest rate floor based on LIBOR		1.25%
Percentage of the principal amount of the Term Loan to be paid quarterly		0.25%
Repricing transaction premium percentage		1.00%
Days allowed to make an offer to prepay		30
Percentage of Term Loan amounts held by lenders		50.00%
Term Loan deferred financing costs		14,000,000
Term Loan debt extinguishment costs	74,000,000	5,000,000
Write-off amount of unamortized deferred financing costs	36,000,000
Write-off amount of debt discount	25,000,000
NDH Project Debt prepayment premiums	13,000,000
Corporate Revolving Facility amount		1,000,000,000
Back-stopped letters of credit amount		83,000,000
Repayment time for drawings under letters of credit		2
Excess amount of asset sales requiring mandatory prepayments		$ 3,000,000