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INCOME TAXES 2 (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets And Liabilities [Line Items]    
Deferred Tax Liabilities, Property, Plant and Equipment $ 4,074us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 3,951us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Regulatory Balancing Accounts 915sre_DeferredTaxLiabilitiesRegulatoryBalancingAccounts 663sre_DeferredTaxLiabilitiesRegulatoryBalancingAccounts
Deferred Tax Liabilities, Property Taxes 57sre_DeferredTaxLiabilitiesPropertyTaxes 50sre_DeferredTaxLiabilitiesPropertyTaxes
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates 650us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates [1] 256us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates [1]
Deferred Tax Liabilities, Other 53us-gaap_DeferredTaxLiabilitiesOther 95us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities 5,749us-gaap_DeferredTaxLiabilities 5,015us-gaap_DeferredTaxLiabilities
Deferred Tax Assets, Tax Credit Carryforwards, General Business 276us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness 105us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Deferred Tax Assets, Equity Method Losses 40sre_DeferredTaxAssetsEquityMethodLosses 16sre_DeferredTaxAssetsEquityMethodLosses
Deferred Tax Assets, Net Operating Loss 1,908us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 2,023us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 244us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 128us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 433us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 264us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Deferred Tax Assets, Other 97us-gaap_DeferredTaxAssetsOther 22us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, State Income Taxes 19sre_DeferredTaxAssetsStateIncomeTaxes 30sre_DeferredTaxAssetsStateIncomeTaxes
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves 73us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves 20us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Deferred Tax Assets, Gross 3,090us-gaap_DeferredTaxAssetsGross 2,608us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance 39us-gaap_DeferredTaxAssetsValuationAllowance 96us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net 3,051us-gaap_DeferredTaxAssetsNet 2,512us-gaap_DeferredTaxAssetsNet
Net deferred income tax liability 2,698sre_DeferredTaxLiabilitiesNet [2] 2,503sre_DeferredTaxLiabilitiesNet [2]
Deferred Tax (Assets) Liabilities, Current, Net (305)sre_DeferredTaxAssetsLiabilitiesCurrentNet (301)sre_DeferredTaxAssetsLiabilitiesCurrentNet
Deferred Tax (Assets) Liabilities, Noncurrent, Net 3,003sre_DeferredTaxAssetsLiabilitiesNoncurrentNet 2,804sre_DeferredTaxAssetsLiabilitiesNoncurrentNet
San Diego Gas and Electric Company [Member]    
Deferred Tax Assets And Liabilities [Line Items]    
Deferred Tax Liabilities, Property, Plant and Equipment 2,181us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 2,040us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Liabilities, Regulatory Balancing Accounts 441sre_DeferredTaxLiabilitiesRegulatoryBalancingAccounts
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 411sre_DeferredTaxLiabilitiesRegulatoryBalancingAccounts
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Liabilities, Property Taxes 39sre_DeferredTaxLiabilitiesPropertyTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 36sre_DeferredTaxLiabilitiesPropertyTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Liabilities, Other 5us-gaap_DeferredTaxLiabilitiesOther
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 28us-gaap_DeferredTaxLiabilitiesOther
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Liabilities 2,666us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 2,515us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Assets, Net Operating Loss 297us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 440us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 8us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 13us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 85us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 57us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Assets, Other 36us-gaap_DeferredTaxAssetsOther
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 20us-gaap_DeferredTaxAssetsOther
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Assets, State Income Taxes 27sre_DeferredTaxAssetsStateIncomeTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 22sre_DeferredTaxAssetsStateIncomeTaxes
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves 39us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 45us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax Assets, Net 492us-gaap_DeferredTaxAssetsNet
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 597us-gaap_DeferredTaxAssetsNet
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Net deferred income tax liability 2,174sre_DeferredTaxLiabilitiesNet
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 [2] 1,918sre_DeferredTaxLiabilitiesNet
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 [2]
Deferred Tax (Assets) Liabilities, Current, Net 53sre_DeferredTaxAssetsLiabilitiesCurrentNet
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 (103)sre_DeferredTaxAssetsLiabilitiesCurrentNet
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Deferred Tax (Assets) Liabilities, Noncurrent, Net 2,121sre_DeferredTaxAssetsLiabilitiesNoncurrentNet
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 2,021sre_DeferredTaxAssetsLiabilitiesNoncurrentNet
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Southern California Gas Company [Member]    
Deferred Tax Assets And Liabilities [Line Items]    
Deferred Tax Liabilities, Property, Plant and Equipment 1,194us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 1,045us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Liabilities, Regulatory Balancing Accounts 481sre_DeferredTaxLiabilitiesRegulatoryBalancingAccounts
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 265sre_DeferredTaxLiabilitiesRegulatoryBalancingAccounts
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Liabilities, Property Taxes 18sre_DeferredTaxLiabilitiesPropertyTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 16sre_DeferredTaxLiabilitiesPropertyTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Liabilities, Other 10us-gaap_DeferredTaxLiabilitiesOther
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 6us-gaap_DeferredTaxLiabilitiesOther
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Liabilities 1,703us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 1,332us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Assets, Net Operating Loss 64us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 65us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 40us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 38us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 261us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 126us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Assets, Other 39us-gaap_DeferredTaxAssetsOther
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 28us-gaap_DeferredTaxAssetsOther
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Assets, State Income Taxes 11sre_DeferredTaxAssetsStateIncomeTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 10sre_DeferredTaxAssetsStateIncomeTaxes
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves 23us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 27us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax Assets, Net 438us-gaap_DeferredTaxAssetsNet
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 294us-gaap_DeferredTaxAssetsNet
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Net deferred income tax liability 1,265sre_DeferredTaxLiabilitiesNet
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 [2] 1,038sre_DeferredTaxLiabilitiesNet
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 [2]
Deferred Tax (Assets) Liabilities, Current, Net 53sre_DeferredTaxAssetsLiabilitiesCurrentNet
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 45sre_DeferredTaxAssetsLiabilitiesCurrentNet
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Deferred Tax (Assets) Liabilities, Noncurrent, Net $ 1,212sre_DeferredTaxAssetsLiabilitiesNoncurrentNet
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember		 $ 993sre_DeferredTaxAssetsLiabilitiesNoncurrentNet
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
[1]
Amounts primarily represent differences in financial and tax bases of depreciable and amortizable assets within our partnerships.
[2]
Our policy is to show deferred income taxes of VIEs on a net basis, including valuation allowances. See table “Amounts Associated with Otay Mesa VIE” in Note 1 for further information.