INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended				3 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012		Jun. 30, 2012 Rockies Express [Member]	Jun. 30, 2013 Rockies Express [Member]	Mar. 31, 2013 Sodigas [Member]	Jun. 30, 2013 Sodigas [Member]	Jun. 30, 2013 Eletrans [Member]	Jun. 30, 2013 Copper Mountain 2 [Member]	Jun. 30, 2013 Mesquite Solar 1 [Member]
Investment In Joint Venture Disclosure [Abstract]
Distributions from RBS Sempra Commodities LLP	$ 50
Investment in RBS Sempra Commodities LLP	76		76
Schedule of Equity Method Investments [Line Items]
Sempra Renewables' Equity Method Investments In Joint Ventures	5	243	5	243
Ownership percentage in equity method investee								25.00%		43.00%	50.00%	50.00%	50.00%
Ownership percentage of minority partner in equity method investee								25.00%
Ownership percentage of operating partner in equity method investee								50.00%
Equity Method Investment, Other than Temporary Impairment							300		10
Equity Method Investment Other Than Temporary Impairment After Tax							179		7
Equity Method Investment, Cumulative Foreign Currency Translation Adjustments	270		270
Equity Method Investment, Remaining Carrying Value								339
Equity earnings, before income tax	8	(293)	18	(281)
Equity earnings, net of income tax	1	8	5	19							(3)
Property, plant and equipment, net	25,171		25,171		25,191	[1]						267
Long-term debt	10,530		10,530		11,621	[1]						146
Pretax loss on sale of Argentina	(7)
Aftertax loss on sale of Argentina	(4)
Proceeds from sale of Argentina	13
Accrued Liabilities, Argentina	$ 250		$ 250

[1] Derived from audited financial statements.