Non-Recourse Debt (Details) (USD $)	1 Months Ended	2 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2013	Jul. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Significant Transactions [Line Items]
Debt Instrument, Face Amount			$ 750,000,000		$ 750,000,000
Extinguishment of Debt, Amount	928,000,000	122,000,000	300,000,000
Loss on extinguishment of debt			(165,000,000)	0	(212,000,000)	0
Nonrecourse Debt Default [Line Items]
Default			1,691,000,000		1,691,000,000
Maritza [Member]
Nonrecourse Debt Default [Line Items]
Net Assets			620,000,000		620,000,000
Changuinola [Member]
Nonrecourse Debt Default [Line Items]
Net Assets			231,000,000		231,000,000
Sonel [Member]
Nonrecourse Debt Default [Line Items]
Net Assets			375,000,000		375,000,000
Kavarna [Member]
Nonrecourse Debt Default [Line Items]
Net Assets			82,000,000		82,000,000
Saurashtra [Member]
Nonrecourse Debt Default [Line Items]
Net Assets			13,000,000		13,000,000
Covenant Violation [Member] | Maritza [Member]
Nonrecourse Debt Default [Line Items]
Default			832,000,000		832,000,000
Covenant Violation [Member] | Changuinola [Member]
Nonrecourse Debt Default [Line Items]
Default			372,000,000		372,000,000
Covenant Violation [Member] | Sonel [Member]
Nonrecourse Debt Default [Line Items]
Default			268,000,000		268,000,000
Covenant Violation [Member] | Kavarna [Member]
Nonrecourse Debt Default [Line Items]
Default			197,000,000		197,000,000
Covenant Violation [Member] | Saurashtra [Member]
Nonrecourse Debt Default [Line Items]
Default			22,000,000		22,000,000
Tiete [Member] | Nonrecourse Debt [Member]
Schedule of Significant Transactions [Line Items]
Debt Instrument, Face Amount			496,000,000		496,000,000
Extinguishment of Debt, Amount					396,000,000
El Salvador [Member] | Nonrecourse Debt [Member]
Schedule of Significant Transactions [Line Items]
Debt Instrument, Face Amount			310,000,000		310,000,000
Extinguishment of Debt, Amount					301,000,000
Sul [Member] | Nonrecourse Debt [Member]
Schedule of Significant Transactions [Line Items]
Debt Instrument, Face Amount			150,000,000		150,000,000
Extinguishment of Debt, Amount					37,000,000
Mong Duong [Member] | Nonrecourse Debt [Member]
Schedule of Significant Transactions [Line Items]
Debt Instrument, Face Amount			210,000,000		210,000,000
DPL Subsidiary [Member] | Nonrecourse Debt [Member]
Schedule of Significant Transactions [Line Items]
Debt Instrument, Face Amount			200,000,000		200,000,000
Extinguishment of Debt, Amount					425,000,000
IPL [Member] | Nonrecourse Debt [Member]
Schedule of Significant Transactions [Line Items]
Debt Instrument, Face Amount			170,000,000		170,000,000
Extinguishment of Debt, Amount					110,000,000
Masinloc [Member] | Nonrecourse Debt [Member]
Schedule of Significant Transactions [Line Items]
Extinguishment of Debt, Amount					500,000,000
Loss on extinguishment of debt					$ 43,000,000