RECENT INVESTMENT ACTIVITY (Details) (USD $)	1 Months Ended	9 Months Ended			0 Months Ended		0 Months Ended		0 Months Ended		1 Months Ended	0 Months Ended
	Feb. 28, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Sep. 19, 2013 Mesquite Solar 1 [Member]	Sep. 19, 2013 Mesquite Solar 1 [Member]	Jul. 11, 2013 Copper Mountain Solar 2 [Member]	Jul. 11, 2013 Copper Mountain Solar 2 [Member]	Jul. 16, 2014 Energia Sierra Juarez [Member]	Jul. 16, 2014 Energia Sierra Juarez [Member]	Feb. 28, 2013 Mesquite Power [Member]	Mar. 13, 2014 Copper Mountain Solar 3 [Member]	Mar. 13, 2014 Copper Mountain Solar 3 [Member]	May 31, 2013 California Solar Partnership [Member]
Recent Investment Activity (Details) [Abstract]
Sempra Renewables' Equity Investment In Solar Projects				$ 109,000,000
Deconsolidation of business [Line Items]
Proceeds from sale, net of transaction costs		94,000,000	168,000,000		100,000,000		68,000,000		26,000,000			68,000,000
Cash		(4,000,000)							(2,000,000)			(2,000,000)
Other current assets		(11,000,000)							(11,000,000)			0
Property, plant and equipment, net		(384,000,000)	(727,000,000)		(461,000,000)		(266,000,000)		(137,000,000)			(247,000,000)
Other assets		(27,000,000)	(102,000,000)		(72,000,000)		(30,000,000)		(16,000,000)			(11,000,000)
Accounts payable and accrued expenses		92,000,000							10,000,000			82,000,000
Due to affiliate		39,000,000							39,000,000			0
Long-term debt including current portion		179,000,000	443,000,000		297,000,000		146,000,000		82,000,000			97,000,000
Other liabilities		10,000,000	50,000,000		31,000,000		19,000,000		7,000,000			3,000,000
Accumulated other comprehensive income		(7,000,000)							(5,000,000)			(2,000,000)
Gain on sale of equity interests	74,000,000	(46,000,000)	(40,000,000)		(36,000,000)		(4,000,000)		(19,000,000)			(27,000,000)
Equity method investments upon deconsolidation		(65,000,000)	(208,000,000)		(141,000,000)		(67,000,000)		(26,000,000)			(39,000,000)
Transaction costs					3,000,000		3,000,000
Ownership percentage in equity method investee						50.00%		50.00%		50.00%			50.00%	50.00%
Proceeds from sale					103,000,000		71,000,000				371,000,000
Proceeds from sale, net of cash sold									24,000,000			66,000,000
Gain on sale, after tax					22,000,000		2,000,000		14,000,000		44,000,000	16,000,000
Gain attributable to remeasurement, after tax									$ 7,000,000