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OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) (USD $) In Millions, unless otherwise specified
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3 Months Ended |
12 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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| Transactions With Affiliates Disclosure [Line Items] |
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| Due from affiliate, noncurrent |
$ 200us-gaap_DueFromRelatedPartiesNoncurrent |
[1] |
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$ 226us-gaap_DueFromRelatedPartiesNoncurrent |
[1] |
| San Diego Gas and Electric Company [Member] |
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| Transactions With Affiliates Disclosure [Line Items] |
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| Due from affiliate, current |
41us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember |
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1us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember |
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| Due to affiliate, current |
2us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember |
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21us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember |
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| Revenues from unconsolidated affiliates |
3us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember |
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3us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember |
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| Southern California Gas Company [Member] |
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| Transactions With Affiliates Disclosure [Line Items] |
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| Due from affiliate, current |
61us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember |
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4us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember |
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| Due to affiliate, current |
0us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember |
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13us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember |
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| Revenues from unconsolidated affiliates |
19us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember |
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18us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember |
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| Due to/from Sempra Energy | San Diego Gas and Electric Company [Member] |
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| Transactions With Affiliates Disclosure [Line Items] |
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| Due from affiliate, current |
40us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
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0us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
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| Due to affiliate, current |
0us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
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17us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
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| Income taxes due from Sempra Energy |
15us-gaap_RelatedPartyTaxExpenseDueFromAffiliatesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
[2] |
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16us-gaap_RelatedPartyTaxExpenseDueFromAffiliatesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
[2] |
| Due to/from Sempra Energy | Southern California Gas Company [Member] |
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| Transactions With Affiliates Disclosure [Line Items] |
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| Due from affiliate, current |
59us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
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0us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
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| Income taxes due to Sempra Energy |
(107)us-gaap_RelatedPartyTaxExpenseDueToAffiliatesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
[2] |
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| Income taxes due from Sempra Energy |
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9us-gaap_RelatedPartyTaxExpenseDueFromAffiliatesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
[2] |
| Subsidiary Of Common Parent S D G E [Member] | Southern California Gas Company [Member] |
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| Transactions With Affiliates Disclosure [Line Items] |
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| Due from affiliate, current |
2us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sre_SubsidiaryOfCommonParentSDGEMember |
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4us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SouthernCaliforniaGasCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sre_SubsidiaryOfCommonParentSDGEMember |
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| Subsdiary Of Common Parent So Cal Gas [Member] | San Diego Gas and Electric Company [Member] |
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| Transactions With Affiliates Disclosure [Line Items] |
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| Due to affiliate, current |
2us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sre_SubsdiaryOfCommonParentSoCalGasMember |
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4us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sre_SubsdiaryOfCommonParentSoCalGasMember |
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| Subsidiary Of Common Parent Other Affiliates [Member] | San Diego Gas and Electric Company [Member] |
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| Transactions With Affiliates Disclosure [Line Items] |
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| Due from affiliate, current |
$ 1us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sre_SubsidiaryOfCommonParentOtherAffiliatesMember |
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$ 1us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = sre_SanDiegoGasAndElectricCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sre_SubsidiaryOfCommonParentOtherAffiliatesMember |
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