v3.8.0.1

GENERAL INFORMATION AND OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Capitalized Financing Costs Disclosure [Line Items] |  |
Total capitalized financing costs | $ 51 | $ 82
San Diego Gas and Electric Company [Member] |  |
Capitalized Financing Costs Disclosure [Line Items] |  |
Total capitalized financing costs | 24 | 20
Southern California Gas Company [Member] |  |
Capitalized Financing Costs Disclosure [Line Items] |  |
Total capitalized financing costs | $ 13 | $ 15

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- Definition Total capitalized financing costs from both debt and equity instruments. + References No definition available. + Details
Name: | sre_CapitalizedFinancingCosts
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | sre_CapitalizedFinancingCostsDisclosureLineItems
Namespace Prefix: | sre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=sre_SanDiegoGasAndElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=sre_SouthernCaliforniaGasCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |