Debt - Non-Recourse Debt Narrative (Details) (Nonrecourse Debt [Member], USD $)	6 Months Ended
	Jun. 30, 2014
Gener Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt	$ 700,000,000
Repayments of debt	853,000,000
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	103,000,000
Construction Loans [Member] | Mong Duong Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt	272,000,000
Construction Loans [Member] | Cochrane Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt	$ 125,000,000