Name:	sre_GeneralRateCaseLineItems
Namespace Prefix:	sre_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

General Rate Case, Proposed Annual Attrition Percent

No definition available.

Name:	sre_GeneralRateCaseProposedAnnualAttritionPercent
Namespace Prefix:	sre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

General Rate Case, Revenue Requirement Adjustment, Percentage

No definition available.

Name:	sre_GeneralRateCaseRevenueRequirementAdjustmentPercentage
Namespace Prefix:	sre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

General Rate Case, Revenue Requirement Adjustment Requested

No definition available.

Name:	sre_GeneralRateCaseRevenueRequirementAdjustmentRequested
Namespace Prefix:	sre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

General Rate Case, Revenue Requirement Requested

No definition available.

Name:	sre_GeneralRateCaseRevenueRequirementRequested
Namespace Prefix:	sre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Liability Associated With Tracked Income Tax Expense Differences

No definition available.

Name:	sre_LiabilityAssociatedWithTrackedIncomeTaxExpenseDifferences
Namespace Prefix:	sre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Regulatory Liability.

No definition available.

Name:	sre_RegulatoryLiability
Namespace Prefix:	sre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Tax Cuts and Jobs Act, Change in Tax Rate, Change in Revenue Requirement

No definition available.

Name:	sre_TaxCutsandJobsActChangeinTaxRateChangeinRevenueRequirement
Namespace Prefix:	sre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Transmission Owner, Formula Rate Revenue Requirement

No definition available.

Name:	sre_TransmissionOwnerFormulaRateRevenueRequirement
Namespace Prefix:	sre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Transmission Owner, Formula Rate Revenue Requirement Increase

No definition available.

Name:	sre_TransmissionOwnerFormulaRateRevenueRequirementIncrease
Namespace Prefix:	sre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Transmission Owner, Formula Rate Revenue Requirement Increase Percentage

No definition available.

Name:	sre_TransmissionOwnerFormulaRateRevenueRequirementIncreasePercentage
Namespace Prefix:	sre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

No definition available.

Name:	us-gaap_OperatingExpenses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=sre_GeneralRateCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=sre_FutureRefundofRatestoCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=sre_FutureRefundofRatestoCustomersFERCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=sre_SempraMexicoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_BusinessAcquisitionAxis=sre_OtayMesaEnergyCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: