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SCHEDULE I, CONDENSED FINANCIAL INFORMATION OF PARENT, FOOTNOTES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 456,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths [1]    
Long-term Debt, Maturities, Repayments of Principal in Year Two 863,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo [1]    
Long-term Debt, Maturities, Repayments of Principal in Year Three 680,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree [1]    
Long-term Debt, Maturities, Repayments of Principal in Year Four 1,059,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour [1]    
Long-term Debt, Maturities, Repayments of Principal in Year Five 822,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive [1]    
Long-term Debt, Maturities, Repayments of Principal after Year Five 8,467,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive [1]    
Debt Instrument, Unamortized Discount 21,000,000us-gaap_DebtInstrumentUnamortizedDiscount 17,000,000us-gaap_DebtInstrumentUnamortizedDiscount  
Long-term debt 12,167,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations 11,253,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations  
Current portion of long-term debt (469,000,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (1,147,000,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent  
Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Maturities, Repayments of Principal in Year Two 750,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Long-term Debt, Maturities, Repayments of Principal in Year Three 600,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Long-term Debt, Maturities, Repayments of Principal in Year Four 500,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Long-term Debt, Maturities, Repayments of Principal in Year Five 500,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Long-term Debt, Maturities, Repayments of Principal after Year Five 2,300,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Debt Instrument, Unamortized Discount (9,000,000)us-gaap_DebtInstrumentUnamortizedDiscount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 (9,000,000)us-gaap_DebtInstrumentUnamortizedDiscount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Long-term debt 4,666,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 4,117,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Current portion of long-term debt 0us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 (800,000,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Build to suit lease 75,000,000sre_BuildToSuitLease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 14,000,000sre_BuildToSuitLease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Rabbi trust investment gain (loss) 27,000,000sre_Rabbitrustinvestmentgainloss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 39,000,000sre_Rabbitrustinvestmentgainloss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 41,000,000sre_Rabbitrustinvestmentgainloss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other Long-term Debt, Due March 2014 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross 0us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueMarch2014Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueMarch2014Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueMarch2014Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Other Long-term Debt, Variable Rate Notes Due March 2014 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross 0us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtVariableRateNotesDueMarch2014Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 300,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtVariableRateNotesDueMarch2014Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 1.01%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtVariableRateNotesDueMarch2014Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Other Long-term Debt, Due June 2018 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueJune2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueJune2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 6.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueJune2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Other Long-term Debt, Due February 2019 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueFebruary2019Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueFebruary2019Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 9.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueFebruary2019Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Other Long-term Debt, Due October 2039 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross 750,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueOctober2039Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 750,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueOctober2039Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueOctober2039Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Market Value Adjustment For Interest Rate Swap [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Market Value Adjustment For Interest Rate Swap 0sre_MarketValueAdjustmentForInterestRateSwap
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_MarketValueAdjustmentForInterestRateSwapMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 12,000,000sre_MarketValueAdjustmentForInterestRateSwap
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_MarketValueAdjustmentForInterestRateSwapMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Other Long Term Debt, Variable Rate Notes Due June 2016 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross 750,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtVariableRateNotesDueJune2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 750,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtVariableRateNotesDueJune2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtVariableRateNotesDueJune2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Debt Instrument, Interest Rate at Period End 4.44%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtVariableRateNotesDueJune2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Other Long Term Debt Due April 2017 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross 600,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueApril2017Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 600,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueApril2017Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 2.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueApril2017Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Other Long Term Debt, Due October 2022 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueOctober2022Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueOctober2022Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 2.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueOctober2022Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Other Long-term Debt, Due December 2023 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueDecember2023Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueDecember2023Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 4.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueDecember2023Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Other Long-term Debt, Due June 2024 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 500,000,000us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueJune2024Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 $ 0us-gaap_DebtInstrumentCarryingAmount
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueJune2024Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Debt Instrument, Interest Rate, Stated Percentage 3.55%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ sre_CondensedFinancialInformationOfParentLongTermDebtAxis
= sre_OtherLongTermDebtDueJune2024Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
[1]
Excludes capital lease obligations, build-to-suit lease and market value adjustments for interest rate swaps.