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FAIR VALUE MEASUREMENTS 6 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 Rockies Express [Member]	Jun. 30, 2012 Rockies Express [Member]	Dec. 31, 2012 Rockies Express [Member]
Schedule Of Equity Method And Other Investments [Line Items]
Equity Method Investment, Other Than Temporary Impairment			$ (100)	$ (300)
Equity Method Investment, Other Than Temporary Impairment, Net Of Tax Benefit			(60)	(179)
Loss on impairment of RBS Sempra Commodities	(16)	(305)
Loss on impairment of RBS Sempra Commodities, after tax	(10)	(139)
Equity Method Investment, Other Than Temporary Impairment, Gross					$ (400)

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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