SEMPRA UTILITIES' REGULATORY MATTERS (Details) (USD $)	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2010
San Diego Gas and Electric Company and Subsidiary [Member] | Wind Farm Project [Member]
Schedule Of Utility Projects [Line Items]
Estimated Project Cost, Maximum	$ 250,000,000
Investment As Percentage Of Total Estimated Project Cost	64.99%
San Diego Gas and Electric Company and Subsidiary [Member]
Schedule Of Regulatory Amounts [Line Items]
Renewable Portfolio Standards, Penalty Per Kilowatt Hour Of Renewable Energy Underdelivery	0.05
General Rate Case, Annual Revenue Requirement Increase	231,000,000
Unrecorded Energy Efficiency Incentive Mechanism Award	15,100,000
Regulatory Recovery, Deductible Per Event	5,000,000
Incremental insurance costs incurred related to catastrophe for 2009-2010 policy period	29,000,000
Incremental insurance costs incurred related to catastrophe for 2010-2011 policy period	63,000,000
General Rate Case, Decrease In Revenue Requirement Increase Request	22,000,000
Southern California Gas Company [Member]
Schedule Of Regulatory Amounts [Line Items]
General Rate Case, Annual Revenue Requirement Increase	263,000,000
Unrecorded Gas Cost Incentive Mechanism Award	6,200,000	6,000,000
Recognized Energy Efficiency Incentive Mechanism Award			12,000,000
Unrecorded Energy Efficiency Incentive Mechanism Award	2,000,000
General Rate Case, Decrease In Revenue Requirement Increase Request	$ 17,000,000