GENERAL INFORMATION AND OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entities [Line Items]
Property, plant and equipment	$ 37,945	$ 36,452	[1]
Long-term debt and finance leases	20,535	20,785	[1]
Equity method investment	11,758	11,519	[1]
ASSETS	68,385	65,665	[1]
Sempra Texas Utilities [Member] | Oncor Holdings [Member]
Variable Interest Entities [Line Items]
Equity method investment	11,758	11,519
Sempra LNG [Member] | Cameron LNG Holdings [Member]
Variable Interest Entities [Line Items]
Equity method investment	1,183	1,256
San Diego Gas and Electric Company [Member]
Variable Interest Entities [Line Items]
Property, plant and equipment	17,510	16,967	[1]
Long-term debt and finance leases	6,691	6,306	[1]
ASSETS	$ 21,333	20,560	[1]
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%
Variable Interest Entity, Not Primary Beneficiary [Member] | San Diego Gas and Electric Company [Member]
Variable Interest Entities [Line Items]
Property, plant and equipment	$ 1,246	1,255
Long-term debt and finance leases	$ 1,246	1,255
Variable Interest Entity, Primary Beneficiary [Member] | Sempra Mexico [Member]
Variable Interest Entities [Line Items]
ASSETS		$ 126

[1] Derived from audited financial statements.