Debt (Non-recourse Debt Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Construction line of credit facility remaining borrowing capacity	$ 2,900,000,000
Other line of credit remaining borrowing capacity	1,400,000,000
Loss on the extinguishment of debt	229,000,000	8,000,000	62,000,000
Restricted cash and debt service reserves	492,000,000	560,000,000
Restricted net assets	2,200,000,000
Debt default amount	1,055,000,000
Non-Recourse Debt | Sonel Subsidiary | Discontinued Operations
Debt Instrument [Line Items]
Net assets	387,000,000
Non-Recourse Debt | Sonel Subsidiary | Covenant Violation | Discontinued Operations
Debt Instrument [Line Items]
Debt default amount	257,000,000
Non-Recourse Debt | Kribi Subsidiary | Discontinued Operations
Debt Instrument [Line Items]
Net assets	3,000,000
Non-Recourse Debt | Kribi Subsidiary | Covenant Violation | Discontinued Operations
Debt Instrument [Line Items]
Debt default amount	247,000,000
Non-Recourse Debt | Saurashtra Subsidiary | Discontinued Operations
Debt Instrument [Line Items]
Net assets	2,000,000
Non-Recourse Debt | Saurashtra Subsidiary | Covenant Violation | Discontinued Operations
Debt Instrument [Line Items]
Debt default amount	21,000,000
Non-Recourse Debt | Tiete Subsidiary
Debt Instrument [Line Items]
Debt face amount	496,000,000
Repayments of long-term debt	396,000,000
Non-Recourse Debt | El Salvador Subsidiary
Debt Instrument [Line Items]
Debt face amount	310,000,000
Repayments of long-term debt	301,000,000
Non-Recourse Debt | Sul Subsidiary
Debt Instrument [Line Items]
Debt face amount	153,000,000
Repayments of long-term debt	44,000,000
Non-Recourse Debt | Mong Duong Subsidiary
Debt Instrument [Line Items]
Debt face amount	471,000,000
Non-Recourse Debt | DPL Subsidiary
Debt Instrument [Line Items]
Debt face amount	200,000,000
Repayments of long-term debt	53,000,000
Debt terminated amount	425,000,000
Non-Recourse Debt | DP&L Subsidiary
Debt Instrument [Line Items]
Debt face amount	445,000,000
Repayments of long-term debt	470,000,000
Non-Recourse Debt | IPL Subsidiary
Debt Instrument [Line Items]
Debt face amount	170,000,000
Repayments of long-term debt	110,000,000
Non-Recourse Debt | Masinloc Subsidiary
Debt Instrument [Line Items]
Debt terminated amount	500,000,000
Loss on the extinguishment of debt	43,000,000
Non-Recourse Debt | Jordan Subsidiary
Debt Instrument [Line Items]
Debt face amount	180,000,000
Non-Recourse Debt | Cochrane Subsidiary
Debt Instrument [Line Items]
Debt face amount	210,000,000
Non-Recourse Debt | Gener Subsidiary
Debt Instrument [Line Items]
Debt face amount	450,000,000
Non-Recourse Debt | Changuinola Subsidiary
Debt Instrument [Line Items]
Debt face amount	420,000,000
Repayments of long-term debt	$ 412,000,000