COMMITMENTS AND CONTINGENCIES - LEASES THAT HAVE NOT YET COMMENCED (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
San Diego Gas and Electric Company [Member]
Lessee, Lease, Description [Line Items]
Lease not yet commenced, due in 2022	$ 8
Lease not yet commenced, due in 2023	17
Lease not yet commenced, due in 2024	18
Lease not yet commenced, due in 2025	18
Lease not yet commenced, due in 2026	18
Lease not yet commenced, due thereafter	101
SoCalGas
Lessee, Lease, Description [Line Items]
Lease not yet commenced, due in 2022	1
Lease not yet commenced, due in 2023	2
Lease not yet commenced, due in 2024	2
Lease not yet commenced, due in 2025	2
Lease not yet commenced, due in 2026	2
Lease not yet commenced, due thereafter	$ 6

Lessee, Operating Lease, Lease Not Yet Commenced, Payments, Thereafter

No definition available.

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

- Definition

Lessee, Operating Lease, Lease Not Yet Commenced, Payments, Year Five

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Lessee, Operating Lease, Lease Not Yet Commenced, Payments, Year Four

+ References

No definition available.

+ Details

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

- Definition

Lessee, Operating Lease, Lease Not Yet Commenced, Payments, Year One

+ References

No definition available.

+ Details

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

- Definition

Lessee, Operating Lease, Lease Not Yet Commenced, Payments, Year Three

+ References

No definition available.

+ Details

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

- Definition

Lessee, Operating Lease, Lease Not Yet Commenced, Payments, Year Two

+ References

No definition available.

+ Details

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

- 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

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

- Details

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

- Details

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