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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	6 Months Ended
	Apr. 15, 2011	Jun. 30, 2012	Jun. 30, 2011
Investment In Joint Venture Disclosure [Abstract]
Distributions from RBS Sempra Commodities LLP	$ 329
Investment in RBS Sempra Commodities LLP		126
Pretax equity earnings (losses) from RBS Sempra Commodities LLP			(8)
Schedule of Equity Method Investments [Line Items]
Sempra Renewables' Equity Method Investments In Joint Ventures		243
Loss on impairment of investment in Rockies Express		300
Loss on impairment of investment in Rockies Express, after tax		179
Investment in Rockies Express		477
Rockies Express [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee		25.00%
Ownership percentage of minority partner in equity method investee		25.00%
Ownership percentage of operating partner in equity method investee		50.00%
Flat Ridge 2 [Member]
Schedule of Equity Method Investments [Line Items]
Sempra Renewables' Equity Method Investments In Joint Ventures		$ 208