DEBT AND CREDIT FACILITIES 3 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended			3 Months Ended
	Mar. 31, 2013 Flat Ridge II [Member]	Mar. 31, 2013 Flat Ridge II [Member] Term Loan, Due June 2023 [Member]	Mar. 31, 2013 Flat Ridge II [Member] Fixed Rate Note, Due June 2035 [Member]	Jun. 30, 2013 Mehoopany Wind [Member]	Jun. 30, 2012 Mehoopany Wind [Member]	Jun. 30, 2013 Mehoopany Wind [Member] Term Loan, Due May 2031 [Member]	Sep. 30, 2013 Mesquite Solar 1 [Member]	Sep. 30, 2013 Copper Mountain 2 [Member]
Schedule of Equity Method Investments [Line Items]
Long-term debt outstanding		$ 242	$ 110			$ 162
Proceeds from return of capital	148			13	17
Liability for guarantee obligation associated with cash flow requirements	3			11
Deconsolidation of debt							$ 297	$ 146