Debt - Non-Recourse Debt Narrative (Details) (Nonrecourse Debt [Member], USD $)	9 Months Ended
	Sep. 30, 2014
Gener Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt	$ 700,000,000
Repayments of debt	905,000,000
IPL Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt	130,000,000
Tiete Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt	129,000,000
Repayments of debt	132,000,000
Alto Maipo [Member]
Debt Instrument [Line Items]
Issued new debt	105,000,000
Sul Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt	111,000,000
Electropaulo [Member]
Debt Instrument [Line Items]
Issued new debt	253,000,000
Construction Loans [Member] | Mong Duong Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt	298,000,000
Construction Loans [Member] | Cochrane Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt	$ 173,000,000