SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details)	9 Months Ended	12 Months Ended
	Oct. 03, 2019 MW	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Total finance leases		$ 1,335,000,000	$ 1,330,000,000	$ 1,289,000,000
Property, plant and equipment, net		43,894,000,000	40,003,000,000	36,452,000,000
Equity method investment		12,947,000,000	12,440,000,000	11,519,000,000
Assets		72,045,000,000	66,623,000,000	65,665,000,000
San Diego Gas and Electric Company [Member]
Variable Interest Entity [Line Items]
Total finance leases		1,274,000,000	1,276,000,000	1,270,000,000
Property, plant and equipment, net		20,048,000,000	18,421,000,000	16,967,000,000
Assets		24,058,000,000	22,311,000,000	20,560,000,000
San Diego Gas and Electric Company [Member] | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total finance leases		1,217,000,000	1,237,000,000	1,255,000,000
Sempra Infrastructure | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Debt instrument, maximum borrowing amount		979,000,000
Sempra Infrastructure | Cameron LNG JV
Variable Interest Entity [Line Items]
Equity method investment		514,000,000	433,000,000	1,256,000,000
Sempra Infrastructure | ECA LNG JV | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		632,000,000	207,000,000
Liabilities		$ 455,000,000	49,000,000
Oncor Electric Delivery Company LLC | Oncor Holdings
Variable Interest Entity [Line Items]
Ownership percentage held by noncontrolling owners		80.25%
Oncor Holdings | Sempra Texas Utilities
Variable Interest Entity [Line Items]
Equity method investment		$ 12,947,000,000	$ 12,440,000,000	$ 11,519,000,000
Sempra Texas Holdings Corp | Oncor Holdings | Sempra Texas Utilities
Variable Interest Entity [Line Items]
Ownership percentage in consolidated entity		100.00%
Otay Mesa VIE | San Diego Gas and Electric Company [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Generating capacity (in mw) | MW	605