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GENERAL (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Seasonality [Line Items]  
Higher Earnings Due To Seasonality $ 113sre_Higherearningsduetoseasonality
Higher Utility Revenue Due to Seasonality 163sre_Higherutilityrevenueduetoseasonality
Southern California Gas Company [Member]  
Seasonality [Line Items]  
Higher Earnings Due To Seasonality 113sre_Higherearningsduetoseasonality
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Higher Utility Revenue Due to Seasonality $ 163sre_Higherutilityrevenueduetoseasonality
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember