GENERAL INFORMATION AND OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entities [Line Items]
Property plant and equipment, net	$ 40,981	$ 40,003	[1]
Finance lease obligations	1,336	1,330
Equity method investment	12,553	12,440	[1]
Assets	67,821	66,623	[1]
Sempra Texas Utilities [Member] | Oncor Holdings [Member]
Variable Interest Entities [Line Items]
Equity method investment	12,553	12,440
Sempra LNG [Member]
Variable Interest Entities [Line Items]
Maximum exposure under guarantor obligations	4,000
Sempra LNG [Member] | Cameron LNG Holdings [Member]
Variable Interest Entities [Line Items]
Equity method investment	513	433
Sempra LNG [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entities [Line Items]
Maximum exposure under guarantor obligations	979
San Diego Gas and Electric Company [Member]
Variable Interest Entities [Line Items]
Property plant and equipment, net	18,769	18,421	[1]
Finance lease obligations	1,276	1,276
Assets	22,474	22,311	[1]
San Diego Gas and Electric Company [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entities [Line Items]
Property plant and equipment, net	1,233	1,237
Finance lease obligations	1,233	1,237
Sempra Energy [Member] | Variable Interest Entity, Primary Beneficiary [Member] | ECA LNGJV [Member]
Variable Interest Entities [Line Items]
Assets	403	207
Liabilities	$ 234	$ 49
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utilities [Member]
Variable Interest Entities [Line Items]
Ownership interest (as a percent)	80.25%
Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member] | Sempra Texas Intermediate Holding Company LLC [Member]
Variable Interest Entities [Line Items]
Ownership percentage in consolidated entity	100.00%

[1] Derived from audited financial statements.