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INVESTMENTS IN UNCONSOLIDATED ENTITIES 5 (Details) (Debt Instrument, Other Sempra Natural Gas [Member], Other Long-term Debt [Member])
Dec. 31, 2014
Debt Instrument, Other Sempra Natural Gas [Member] | Other Long-term Debt [Member]
  
Schedule Of Equity Method And Other Investments [Line Items]  
Debt Instrument, Interest Rate At Period End 3.19%sre_DebtInstrumentInterestRateAtPeriodEnd1
/ us-gaap_DebtInstrumentAxis
= sre_OtherLongTermDebtMember
/ sre_DebtInstrumentBorrowerAxis
= sre_DebtInstrumentOtherSempraNaturalGasMember