Equitization of Long-Term Debt For Deficit Held by Noncontrolling Interest

No definition available.

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

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

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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

- Definition

The cash outflow from the repayment of a long-term debt instrument issued, secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default.

+ References

+ Details

Name:	us-gaap_RepaymentsOfFirstMortgageBond
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=sre_FirstMortgageBondsDue2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_BondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sre_FirstMortgageBondsDueJune2050Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sre_SeniorUnsecuredNotesMaturing2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=sre_FourPointSevenFivePercentSeniorUnsecuredNotesMaturing2051Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=sre_JapanInternationalCooperationAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sre_IEnovaLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=sre_U.S.InternationalDevelopmentFinanceCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=sre_LibertyGasStorageLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DEBT AND CREDIT FACILITIES - LONG-TERM DEBT (Details) - USD ($)		1 Months Ended				3 Months Ended	9 Months Ended
	Mar. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Apr. 30, 2020	Jan. 31, 2020	Dec. 31, 2020	Sep. 30, 2020
Debt Instrument [Line Items]
Equitization of long-term debt for deficit held by NCI							$ 22,000,000
Southern California Gas Company [Member] \| First Mortgage Bonds, Due 2030 [Member]
Debt Instrument [Line Items]
Stated rate of debt (as a percent)					2.55%
Bonds [Member] \| San Diego Gas and Electric Company [Member] \| Forecast [Member]
Debt Instrument [Line Items]
Repayments of first mortgage bonds						$ 250,000,000
Bonds [Member] \| San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due 2030 [Member]
Debt Instrument [Line Items]
Debt amount		$ 800,000,000					$ 800,000,000
Stated rate of debt (as a percent)		1.70%					1.70%
Net proceeds of debt		$ 792,000,000
Debt issuance costs		8,000,000					$ 8,000,000
Bonds [Member] \| San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due 2050 [Member]
Debt Instrument [Line Items]
Debt amount				$ 400,000,000
Stated rate of debt (as a percent)				3.32%
Net proceeds of debt				$ 395,000,000
Debt issuance costs				5,000,000
Repayments of lines of credit				200,000,000
Bonds [Member] \| Southern California Gas Company [Member] \| First Mortgage Bonds, Due 2030 [Member]
Debt Instrument [Line Items]
Debt amount					$ 650,000,000
Net proceeds of debt					643,000,000
Debt issuance costs					$ 7,000,000
Unsecured Debt [Member] \| Southern California Gas Company [Member] \| Senior Unsecured Notes Maturing 2023 [Member]
Debt Instrument [Line Items]
Debt amount		300,000,000					300,000,000
Net proceeds of debt		298,000,000
Debt issuance costs		$ 2,000,000					2,000,000
Redemption of principal amount (as a percent)		100.00%
Unsecured Debt [Member] \| Sempra Mexico [Member] \| Four Point Seven Five Percent Senior Unsecured Notes Maturing 2051 [Member]
Debt Instrument [Line Items]
Debt amount		$ 800,000,000					$ 800,000,000
Stated rate of debt (as a percent)		4.75%					4.75%
Net proceeds of debt		$ 770,000,000
Debt issuance costs		$ 30,000,000					$ 30,000,000
Japan International Cooperation Agency [Member] \| Sempra Mexico [Member] \| IEnova Loan Agreement [Member]
Debt Instrument [Line Items]
Net proceeds of debt				98,000,000
Debt issuance costs				2,000,000
Proceeds from debt issuance				$ 100,000,000
Fixed interest rate (as a percent)				2.38%
U.S. International Development Finance Corporation [Member] \| Sempra Mexico [Member] \| IEnova Loan Agreement [Member]
Debt Instrument [Line Items]
Net proceeds of debt			$ 236,000,000
Debt issuance costs			5,000,000
Proceeds from debt issuance			$ 241,000,000
Fixed interest rate (as a percent)			2.90%
Liberty Gas Storage, LLC [Member] \| Sempra LNG [Member]
Debt Instrument [Line Items]
Equitization of long-term debt for deficit held by NCI	$ 22,000,000
LIBOR [Member] \| Unsecured Debt [Member] \| Southern California Gas Company [Member] \| Senior Unsecured Notes Maturing 2023 [Member]
Debt Instrument [Line Items]
Spread on variable rate (as a percent)		35.00%
LIBOR [Member] \| Japan International Cooperation Agency [Member] \| Sempra Mexico [Member] \| IEnova Loan Agreement [Member]
Debt Instrument [Line Items]
Spread on variable rate (as a percent)				1.50%