GENERAL INFORMATION AND OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) $ in Millions	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)		Jul. 31, 2020 projectOwner
Variable Interest Entities [Line Items]
Property plant and equipment, net	$ 48,351	$ 61,437	[1]
Finance lease obligations	1,305	1,315
Equity method investment	17,038	15,400	[1]
Assets	106,919	96,155	[1]
SI Partners | Disposal Group Held-for-sale
Variable Interest Entities [Line Items]
Equity method investment, held for sale	2,471
Oncor Holdings | Sempra Texas Utilities
Variable Interest Entities [Line Items]
Equity method investment	17,038	15,400
Cameron LNG Holdings | Sempra Infrastructure
Variable Interest Entities [Line Items]
Equity method investment	1,198	1,149
Cameron LNG Holdings | Sempra Infrastructure | SI Partners | Disposal Group Held-for-sale
Variable Interest Entities [Line Items]
Equity method investment, held for sale	1,181
Cameron LNG JV | Sempra Infrastructure | Corporate Joint Venture
Variable Interest Entities [Line Items]
Liability cap, amount	979
SDG&E
Variable Interest Entities [Line Items]
Property plant and equipment, net	26,093	25,111	[2]
Finance lease obligations	1,181	1,205
Assets	32,839	30,773	[2]
Cameron LNG JV
Variable Interest Entities [Line Items]
Number of project owners | projectOwner				4
IEnova | Loan Agreement To Finance Natural Gas Liquefaction Export Facility
Variable Interest Entities [Line Items]
Maximum exposure under guarantor obligations	1,226
TotalEnergies SE | Loan Agreement To Finance Natural Gas Liquefaction Export Facility
Variable Interest Entities [Line Items]
Maximum exposure under guarantor obligations	$ 305
SI Partners and ConocoPhillips | Port Arthur LNG I
Variable Interest Entities [Line Items]
Funding commitment (in percent)	110.00%
SI Partners and ConocoPhillips | Port Arthur LNG I
Variable Interest Entities [Line Items]
Funding commitment, aggregate amount	$ 9,000
SI Partners
Variable Interest Entities [Line Items]
Maximum exposure under guarantor obligations	72
Guarantees, carrying value	300
SI Partners | PA2 JVCo
Variable Interest Entities [Line Items]
Funding commitment, construction project	$ 7,800
SI Partners | Port Arthur LNG I
Variable Interest Entities [Line Items]
Guaranteed funding amount (in percent)	70.00%
Blackstone | PA2 JVCo
Variable Interest Entities [Line Items]
Funding commitment, construction project	$ 7,000
Variable Interest Entity, Not Primary Beneficiary | Sempra Infrastructure
Variable Interest Entities [Line Items]
Maximum exposure under guarantor obligations	979
Guarantees, carrying value	39
Variable Interest Entity, Not Primary Beneficiary | SDG&E
Variable Interest Entities [Line Items]
Property plant and equipment, net	1,116	1,138
Finance lease obligations	1,116	1,138
Variable Interest Entity, Primary Beneficiary | Sempra Infrastructure | ECA LNG Phase 1, Port Arthur LNG and Port Arthur LNG II
Variable Interest Entities [Line Items]
Assets	14,130	8,177
Liabilities	$ 5,288	$ 2,664

[1] Derived from audited financial statements.

[2] Derived from audited financial statements.