SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capitalized Financing Costs Disclosure [Line Items]
Total capitalized financing costs	$ 217	$ 202	$ 183
San Diego Gas and Electric Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
Total capitalized financing costs	106	104	75
SoCalGas
Capitalized Financing Costs Disclosure [Line Items]
Total capitalized financing costs	$ 64	$ 55	$ 47