v3.6.0.2

REGULATORY MATTERS - COST OF CAPITAL & FERC RATES (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Apr. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2019
Southern California Gas Company [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Benchmark Rate |  | 4.24% |
Cost Of Capital Floor Rate |  | 3.24% |
Cost Of Capital Ceiling Rate |  | 5.24% |
Cost Of Capital Average Benchmark Rate |  | 4.01% |
Cost Of Capital Authorized Weighting |  | 100.00% |
Cost Of Capital Authorized Return On Rate Base |  | 8.02% |
Southern California Gas Company [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Potential Reduced Return On Equity |  |  | 10.05%
Southern California Gas Company [Member] | Capital Structure, Long Term Debt [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Authorized Weighting |  | 45.60% |
Cost Of Capital Authorized Rate Of Recovery |  | 5.77% |
Cost Of Capital Weighted Authorized Return On Rate Base |  | 2.63% |
Southern California Gas Company [Member] | Capital Structure, Preferred Stock [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Authorized Weighting |  | 2.40% |
Cost Of Capital Authorized Rate Of Recovery |  | 6.00% |
Cost Of Capital Weighted Authorized Return On Rate Base |  | 0.14% |
Southern California Gas Company [Member] | Capital Structure, Common Equity [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Authorized Weighting |  | 52.00% |
Cost Of Capital Authorized Rate Of Recovery |  | 10.10% |
Cost Of Capital Weighted Authorized Return On Rate Base |  | 5.25% |
San Diego Gas and Electric Company [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Benchmark Rate |  | 4.24% |
Cost Of Capital Floor Rate |  | 3.24% |
Cost Of Capital Ceiling Rate |  | 5.24% |
Cost Of Capital Average Benchmark Rate |  | 4.01% |
Cost Of Capital Authorized Weighting |  | 100.00% |
Cost Of Capital Authorized Return On Rate Base |  | 7.79% |
San Diego Gas and Electric Company [Member] | Federal Energy Regulatory Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Estimated Weighting |  | 100.00% |
Cost Of Capital Weighted Estimated Return On Rate Base |  | 7.51% |
Recovery Of Wildfire Damage Expenses Awarded In FERC Decision | $ 23 |  |
San Diego Gas and Electric Company [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Potential Reduced Return On Equity |  |  | 10.20%
San Diego Gas and Electric Company [Member] | Capital Structure, Long Term Debt [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Authorized Weighting |  | 45.25% |
Cost Of Capital Authorized Rate Of Recovery |  | 5.00% |
Cost Of Capital Weighted Authorized Return On Rate Base |  | 2.26% |
San Diego Gas and Electric Company [Member] | Capital Structure, Long Term Debt [Member] | Federal Energy Regulatory Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Estimated Weighting |  | 43.48% |
Cost Of Capital Estimated Rate Of Recovery |  | 4.21% |
Cost Of Capital Weighted Estimated Return On Rate Base |  | 1.83% |
San Diego Gas and Electric Company [Member] | Capital Structure, Preferred Stock [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Authorized Weighting |  | 2.75% |
Cost Of Capital Authorized Rate Of Recovery |  | 6.22% |
Cost Of Capital Weighted Authorized Return On Rate Base |  | 0.17% |
San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | California Public Utilities Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Cost Of Capital Authorized Weighting |  | 52.00% |
Cost Of Capital Authorized Rate Of Recovery |  | 10.30% |
Cost Of Capital Weighted Authorized Return On Rate Base |  | 5.36% |
San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | Federal Energy Regulatory Commission [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Authorized Return On Equity |  | 10.05% |
Cost Of Capital Estimated Weighting |  | 56.52% |
Cost Of Capital Weighted Estimated Return On Rate Base |  | 5.68% |

X
- Definition Cost Of Capital Authorized Rate Of Recovery + References No definition available. + Details
Name: | sre_CostOfCapitalAuthorizedRateOfRecovery
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost Of Capital Authorized Return On Rate Base + References No definition available. + Details
Name: | sre_CostOfCapitalAuthorizedReturnOnRateBase
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost Of Capital Authorized Weighting + References No definition available. + Details
Name: | sre_CostOfCapitalAuthorizedWeighting
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | sre_CostOfCapitalAverageBenchmarkRate
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | sre_CostOfCapitalBenchmarkRate
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | sre_CostOfCapitalCeilingRate
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Cost Of Capital Estimated Rate Of Recovery + References No definition available. + Details
Name: | sre_CostOfCapitalEstimatedRateOfRecovery
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost Of Capital Estimated Weighting + References No definition available. + Details
Name: | sre_CostOfCapitalEstimatedWeighting
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | sre_CostOfCapitalFloorRate
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Cost Of Capital Potential Reduced Return On Equity + References No definition available. + Details
Name: | sre_CostOfCapitalPotentialReducedReturnOnEquity
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost Of Capital Weighted Authorized Return On Rate Base + References No definition available. + Details
Name: | sre_CostOfCapitalWeightedAuthorizedReturnOnRateBase
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost Of Capital Weighted Estimated Return On Rate Base + References No definition available. + Details
Name: | sre_CostOfCapitalWeightedEstimatedReturnOnRateBase
Namespace Prefix: | sre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyDamagesAwardedValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=sre_CaliforniaPublicUtilitiesCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sre_CapitalStructureCategoryAxis=sre_CapitalStructureLongTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sre_CapitalStructureCategoryAxis=sre_CapitalStructurePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sre_CapitalStructureCategoryAxis=sre_CapitalStructureCommonEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=sre_FederalEnergyRegulatoryCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |