Debt (Project Financing, Notes Payable and Others) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 11,112		$ 10,750
Steamboat [Member]
Debt Instrument [Line Items]
Long-term Debt	418		428
Debt Instrument, Interest Rate, Effective Percentage	6.80%	[1]	6.80%	[1]
OMEC [Member]
Debt Instrument [Line Items]
Long-term Debt	335		345
Debt Instrument, Interest Rate, Effective Percentage	6.90%	[1]	6.80%	[1]
Russell City Project [Member]
Debt Instrument [Line Items]
Long-term Debt	593		507
Debt Instrument, Interest Rate, Effective Percentage	4.90%	[1]	3.60%	[1]
Pasadena [Member]
Debt Instrument [Line Items]
Long-term Debt	135	[2]	160	[2]
Debt Instrument, Interest Rate, Effective Percentage	8.90%	[1],[2]	8.90%	[1],[2]
Bethpage [Member]
Debt Instrument [Line Items]
Long-term Debt	88	[3]	93	[3]
Debt Instrument, Interest Rate, Effective Percentage	7.00%	[1],[3]	7.00%	[1],[3]
Los Esteros Project [Member]
Debt Instrument [Line Items]
Long-term Debt	305		209
Debt Instrument, Interest Rate, Effective Percentage	3.40%	[1]	3.50%	[1]
Gilroy note payable [Member]
Debt Instrument [Line Items]
Long-term Debt	15		33
Debt Instrument, Interest Rate, Effective Percentage	11.20%	[1]	10.80%	[1]
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt	12		14
Debt Instrument, Interest Rate, Effective Percentage	0.00%	[1]	0.00%	[1]
Project Financing Total [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 1,901		$ 1,789

[1] Our weighted average interest rate calculation includes the amortization of deferred financing costs and debt discount or premium.

[2] Represents a sale-leaseback transaction that is accounted for as financing transaction under U.S. GAAP.

[3] Represents a weighted average of first and second lien loans for the weighted average effective interest rates.