CALIFORNIA UTILITIES' REGULATORY MATTERS (Details) (USD $)	3 Months Ended
	Jun. 30, 2012
San Diego Gas and Electric Company and Subsidiary [Member]
Schedule Of Regulatory Amounts [Line Items]
General Rate Case, Annual Revenue Requirement Increase	$ 235,000,000
General Rate Case, Percentage Annual Revenue Requirement Increase	14.60%
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, Revenue Requirement Request	1,849,000,000
Incremental Insurance Premiums Cost Recovery In GRC	67,000,000
Incremental Insurance Premiums Included In 2011 Earnings	28,000,000
Authorized Return On Equity	11.10%
Authorized Return On Rate Base	8.40%
Authorized Capital Structure, Common Equity	49.00%
Requested Return On Equity	11.00%
Requested Return On Rate Base	8.20%
Requested Capital Structure, Common Equity	52.00%
Nuclear Plant, Ownership Percentage	20.00%
Nuclear Plant, Proportional Investment	178,000,000
Nuclear Plant, Replacement Power Costs	25,000,000
Nuclear Plant, Rate Base Investment	228,000,000
Nuclear Plant, Net Book Investment	463,000,000
Nuclear Plant, MHI Limited Liability	137,000,000
Southern California Gas Company [Member]
Schedule Of Regulatory Amounts [Line Items]
General Rate Case, Annual Revenue Requirement Increase	268,000,000
General Rate Case, Percentage Annual Revenue Requirement Increase	14.50%
Unrecorded Gas Cost Incentive Mechanism Award	5,400,000
General Rate Case, Revenue Requirement Request	2,112,000,000
Market Indexed Capital Adjustment Mechanism Floor Rate	3.88%
Recognized Gas Cost Incentive Mechanism Award 2010-2011	6,200,000
Authorized Return On Equity	10.82%
Authorized Return On Rate Base	8.68%
Authorized Capital Structure, Common Equity	48.00%
Requested Return On Equity	10.90%
Requested Return On Rate Base	8.42%
Requested Capital Structure, Common Equity	52.00%
Pro Forma MICAM Adjusted Return On Rate Base	7.99%
Pro Forma MICAM Adjusted Return On Equity	10.02%
East County Substation [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
Schedule Of Utility Projects [Line Items]
Estimated Project Cost	435,000,000
South Orange County Reliability Enhancement [Member] | San Diego Gas and Electric Company and Subsidiary [Member]
Schedule Of Utility Projects [Line Items]
Estimated Project Cost	473,000,000
Aliso Canyon Natural Gas Storage Compressor Replacement [Member] | Southern California Gas Company [Member]
Schedule Of Utility Projects [Line Items]
Estimated Project Cost	$ 200,000,000