GENERAL INFORMATION AND OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense	$ 21	$ (342)	$ 435	$ (45)
Income (loss) before income taxes and equity earnings	165	(1,365)	1,194	(316)
Equity earnings, before income tax:	134	137	436	457
Pretax income (loss)	$ 299	$ (1,228)	$ 1,630	$ 141
Effective income tax rate (as a percent)	7.00%	28.00%	27.00%	(32.00%)
Deferred income tax liability for foreign earnings	$ 120		$ 120
San Diego Gas and Electric Company
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense	35	$ 90	141	$ 168
Income (loss) before income taxes and equity earnings	$ 306	$ 295	$ 822	$ 771
Effective income tax rate (as a percent)	11.00%	31.00%	17.00%	22.00%
Southern California Gas Company
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense	$ (28)	$ (437)	$ 75	$ (335)
Income (loss) before income taxes and equity earnings	$ (110)	$ (1,563)	$ 415	$ (959)
Effective income tax rate (as a percent)	25.00%	28.00%	18.00%	35.00%