RECENT INVESTMENT ACTIVITY (Details) - USD ($)			9 Months Ended
	Jul. 16, 2014	Mar. 13, 2014	Sep. 30, 2014
Deconsolidation of business [Line Items]
Proceeds from sale, net of transaction costs			$ 94,000,000
Cash			(4,000,000)
Other current assets			(11,000,000)
Property, plant and equipment, net			(384,000,000)
Other assets			(27,000,000)
Accounts payable and accrued expenses			92,000,000
Due to affiliate			39,000,000
Long-term debt including current portion			179,000,000
Other liabilities			10,000,000
Accumulated other comprehensive income			(7,000,000)
Gain on sale of equity interests			(46,000,000)
Equity method investments upon deconsolidation			$ (65,000,000)
Energia Sierra Juarez [Member]
Deconsolidation of business [Line Items]
Proceeds from sale, net of transaction costs	$ 26,000,000
Cash	(2,000,000)
Other current assets	(11,000,000)
Property, plant and equipment, net	(137,000,000)
Other assets	(16,000,000)
Accounts payable and accrued expenses	10,000,000
Due to affiliate	39,000,000
Long-term debt including current portion	82,000,000
Other liabilities	7,000,000
Accumulated other comprehensive income	(5,000,000)
Gain on sale of equity interests	(19,000,000)
Equity method investments upon deconsolidation	(26,000,000)
Proceeds from sale, net of cash sold	$ 24,000,000
Mesquite Power [Member]
Deconsolidation of business [Line Items]
Gain on sale of equity interests		$ 61,000,000
Proceeds from sale		347,000,000
Gain on sale, after tax		36,000,000
Copper Mountain Solar 3 [Member]
Deconsolidation of business [Line Items]
Proceeds from sale, net of transaction costs		68,000,000
Cash		(2,000,000)
Other current assets		0
Property, plant and equipment, net		(247,000,000)
Other assets		(11,000,000)
Accounts payable and accrued expenses		82,000,000
Due to affiliate		0
Long-term debt including current portion		97,000,000
Other liabilities		3,000,000
Accumulated other comprehensive income		(2,000,000)
Gain on sale of equity interests		(27,000,000)
Equity method investments upon deconsolidation		(39,000,000)
Proceeds from sale, net of cash sold		66,000,000
Gain on sale, after tax		$ 16,000,000