GENERAL INFORMATION AND OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense	$ 376	$ 334
Income before income taxes and equity earnings	1,329	665
Equity earnings, before income tax:	132	143
Pretax income	$ 1,461	$ 808
Effective income tax rate (as a percent)	26.00%	41.00%
Deferred income tax liability for foreign earnings		$ 120
San Diego Gas and Electric Company
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense	$ 7	64
Income before income taxes and equity earnings	$ 265	$ 298
Effective income tax rate (as a percent)	3.00%	21.00%
Southern California Gas Company
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense	$ 94	$ 84
Income before income taxes and equity earnings	$ 454	$ 418
Effective income tax rate (as a percent)	21.00%	20.00%