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INCOME TAXES (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Line Items]      
U.S. federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Utility depreciation 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation 6.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
Income tax restructuring related to IEnova stock offerings 0.00%sre_EffectiveIncomeTaxRateReconciliationIncomeTaxRestructuringRelatedToSubsidiaryStockOffering 4.00%sre_EffectiveIncomeTaxRateReconciliationIncomeTaxRestructuringRelatedToSubsidiaryStockOffering 0.00%sre_EffectiveIncomeTaxRateReconciliationIncomeTaxRestructuringRelatedToSubsidiaryStockOffering
State income taxes, net of federal income tax benefit 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Utility repair allowance (5.00%)sre_EffectiveIncomeTaxRateReconciliationUtilityRepairAllowance (5.00%)sre_EffectiveIncomeTaxRateReconciliationUtilityRepairAllowance (8.00%)sre_EffectiveIncomeTaxRateReconciliationUtilityRepairAllowance
Tax credits (4.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (7.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Non-U.S. earnings taxed at lower statutory income tax rates (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (4.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Self-developed software expenditures (3.00%)sre_EffectiveIncomeTaxRateReconciliationSelfDevelopedSoftwareExpenditures (3.00%)sre_EffectiveIncomeTaxRateReconciliationSelfDevelopedSoftwareExpenditures (5.00%)sre_EffectiveIncomeTaxRateReconciliationSelfDevelopedSoftwareExpenditures
Allowance for equity funds used during construction (2.00%)sre_EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstruction (1.00%)sre_EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstruction (4.00%)sre_EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstruction
Adjustments to prior years' tax items (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Mexican foreign exchange and inflation effects (2.00%)sre_EffectiveIncomeTaxRateReconciliationForeignExchangeAndInflationEffects 0.00%sre_EffectiveIncomeTaxRateReconciliationForeignExchangeAndInflationEffects 1.00%sre_EffectiveIncomeTaxRateReconciliationForeignExchangeAndInflationEffects
Life insurance contract 0.00%sre_EffectiveIncomeTaxRateReconciliationLifeInsuranceContract 0.00%sre_EffectiveIncomeTaxRateReconciliationLifeInsuranceContract (7.00%)sre_EffectiveIncomeTaxRateReconciliationLifeInsuranceContract
International tax reform (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Other, net (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
U.S. tax on repatriation of foreign earnings 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
Effective income tax rate 20.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 26.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 6.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Income (Loss) from Continuing Operations before Income Taxes, Domestic $ 1,014us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 941us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 442us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Income (Loss) from Continuing Operations before Income Taxes, Foreign 510us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 489us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 501us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes and equity earnings of certain unconsolidated subsidiaries 1,524us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,430us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 943us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense related to corporate reorganization   63sre_IncomeTaxExpenseRelatedToCorporateReorganization  
Income Tax Expense Louisiana valuation allowance release 25sre_Incometaxexpenselouisianavaluationallowancerelease    
SONGS tax regulatory asset write-off 17sre_Incometaxexpensetaxregulatoryassetswriteoff    
San Diego Gas and Electric Company [Member]      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Line Items]      
U.S. federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Utility depreciation 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
State income taxes, net of federal income tax benefit 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Utility repair allowance (4.00%)sre_EffectiveIncomeTaxRateReconciliationUtilityRepairAllowance
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (4.00%)sre_EffectiveIncomeTaxRateReconciliationUtilityRepairAllowance
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (4.00%)sre_EffectiveIncomeTaxRateReconciliationUtilityRepairAllowance
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Self-developed software expenditures (3.00%)sre_EffectiveIncomeTaxRateReconciliationSelfDevelopedSoftwareExpenditures
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (3.00%)sre_EffectiveIncomeTaxRateReconciliationSelfDevelopedSoftwareExpenditures
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (3.00%)sre_EffectiveIncomeTaxRateReconciliationSelfDevelopedSoftwareExpenditures
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Allowance for equity funds used during construction (2.00%)sre_EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstruction
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (2.00%)sre_EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstruction
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (4.00%)sre_EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstruction
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Adjustments to prior years' tax items (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Variable interest entities (1.00%)sre_EffectiveIncomeTaxRateReconciliationVariableInterestEntities
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (1.00%)sre_EffectiveIncomeTaxRateReconciliationVariableInterestEntities
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (1.00%)sre_EffectiveIncomeTaxRateReconciliationVariableInterestEntities
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Other, net 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
SONGS tax regulatory asset write-off 2.00%sre_Effectiveincometaxratereconciliationtaxregulatoryassetswriteoffattributabletonuclearplant
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 0.00%sre_Effectiveincometaxratereconciliationtaxregulatoryassetswriteoffattributabletonuclearplant
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 0.00%sre_Effectiveincometaxratereconciliationtaxregulatoryassetswriteoffattributabletonuclearplant
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Effective income tax rate 34.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 31.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 27.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Income before income taxes and equity earnings of certain unconsolidated subsidiaries 797us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 626us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 705us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Southern California Gas Company [Member]      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Line Items]      
U.S. federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Utility depreciation 8.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 6.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 7.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
State income taxes, net of federal income tax benefit 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Utility repair allowance (9.00%)sre_EffectiveIncomeTaxRateReconciliationUtilityRepairAllowance
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 (9.00%)sre_EffectiveIncomeTaxRateReconciliationUtilityRepairAllowance
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 (12.00%)sre_EffectiveIncomeTaxRateReconciliationUtilityRepairAllowance
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Self-developed software expenditures (5.00%)sre_EffectiveIncomeTaxRateReconciliationSelfDevelopedSoftwareExpenditures
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 (6.00%)sre_EffectiveIncomeTaxRateReconciliationSelfDevelopedSoftwareExpenditures
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 (9.00%)sre_EffectiveIncomeTaxRateReconciliationSelfDevelopedSoftwareExpenditures
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Allowance for equity funds used during construction (2.00%)sre_EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstruction
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 (1.00%)sre_EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstruction
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 (2.00%)sre_EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstruction
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Adjustments to prior years' tax items (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 (5.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Other, net 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Effective income tax rate 29.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 24.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 21.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Income before income taxes and equity earnings of certain unconsolidated subsidiaries $ 472us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 $ 481us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 $ 369us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember