DERIVATIVE FINANCIAL INSTRUMENTS 5 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012
Reclassification Of Cash Flow Hedge Gain (Loss) [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (12)
San Diego Gas and Electric Company and Subsidiary [Member]
Reclassification Of Cash Flow Hedge Gain (Loss) [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(6)
Southern California Gas Company [Member]
Reclassification Of Cash Flow Hedge Gain (Loss) [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (1)