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NUCLEAR PLANT 1 (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
6 Months Ended |
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Mar. 31, 2015
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Dec. 31, 2014
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Mar. 31, 2014
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Jun. 30, 2013
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| Nuclear Plant [Line Items] |
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| Nuclear decommissioning trusts |
$ 1,150us-gaap_DecommissioningFundInvestments |
$ 1,131us-gaap_DecommissioningFundInvestments |
[1] |
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| Nuclear Plant Investment [Line Items] |
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| Plant closure (adjustment) loss |
(21)sre_LossFromPlantClosurePretax |
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|
(13)sre_LossFromPlantClosurePretax |
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| Loss (Adjustment) From Plant Closure, After Tax |
(13)sre_AdjustmentToLossFromPlantClosureAfterTax |
12sre_AdjustmentToLossFromPlantClosureAfterTax |
|
9sre_AdjustmentToLossFromPlantClosureAfterTax |
|
| Loss from plant closure, after-tax (cumulative) |
127sre_LossFromPlantClosureAfterTax |
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|
119sre_LossFromPlantClosureAfterTax |
| Charge To Reduce Certain Tax Regulatory Assets Attributable To Nuclear Plant |
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17sre_ChargeToReduceTaxRegulatoryAssetsAttributableToNuclearPlant |
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| Regulatory Asset, Current, Nuclear Plant Closure |
41sre_RegulatoryAssetCurrentNuclearPlantClosure |
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| Regulatory Asset, Nuclear Plant Closure |
294sre_RegulatoryAssetNuclearPlantClosure |
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| Regulatory Asset, Noncurrent, Nuclear Plant Closure |
253sre_RegulatoryAssetNoncurrentNuclearPlantClosure |
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| Other Commitments [Line Items] |
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| Five-year research funding commitment, annual amount |
1us-gaap_OtherCommitment |
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| San Diego Gas and Electric Company [Member] |
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| Nuclear Plant [Line Items] |
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| Nuclear decommissioning trusts |
1,150us-gaap_DecommissioningFundInvestments
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
1,131us-gaap_DecommissioningFundInvestments
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
[1] |
|
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| Nuclear Plant Investment [Line Items] |
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| Utility plant closure (adjustment) loss |
(21)sre_UtilityLossFromPlantClosurePretax
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
|
|
(13)sre_UtilityLossFromPlantClosurePretax
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
|
| Loss (Adjustment) From Plant Closure, After Tax |
(13)sre_AdjustmentToLossFromPlantClosureAfterTax
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
12sre_AdjustmentToLossFromPlantClosureAfterTax
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
|
9sre_AdjustmentToLossFromPlantClosureAfterTax
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
|
| Loss from plant closure, after-tax (cumulative) |
127sre_LossFromPlantClosureAfterTax
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
|
|
|
119sre_LossFromPlantClosureAfterTax
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
| Charge To Reduce Certain Tax Regulatory Assets Attributable To Nuclear Plant |
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|
|
17sre_ChargeToReduceTaxRegulatoryAssetsAttributableToNuclearPlant
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
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| Regulatory Asset, Current, Nuclear Plant Closure |
41sre_RegulatoryAssetCurrentNuclearPlantClosure
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
|
|
|
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| Regulatory Asset, Nuclear Plant Closure |
294sre_RegulatoryAssetNuclearPlantClosure
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
|
|
|
|
| Regulatory Asset, Noncurrent, Nuclear Plant Closure |
253sre_RegulatoryAssetNoncurrentNuclearPlantClosure
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
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| Other Commitments [Line Items] |
|
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|
|
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| Five-year research funding commitment, annual amount |
$ 1us-gaap_OtherCommitment
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember |
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| Nuclear Plant, SDGE [Member] |
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| Nuclear Plant [Line Items] |
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| Nuclear Plant, Ownership Percentage |
20.00%sre_NuclearPlantOwnershipPercentage
/ sre_NuclearPlantOwnershipAxis
= sre_NuclearPlantSdgeMember |
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