RECENT INVESTMENT ACTIVITY 2 (DETAILS) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 28, 2013	Mar. 31, 2012 Willmut Gas [Member]	May 20, 2012 Willmut Gas [Member]
Property, plant and equipment
Total liabilities			$ (10)
Pro forma revenues		6
Cash consideration (fair value of total consideration)			19
Proceeds from sale of Mesquite Power plant	371
Gain on sale of Mesquite Power plant	$ 74