GENERAL INFORMATION AND OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ (52)	$ 21	$ 499	$ 435
Income before income taxes and equity earnings	323	165	2,175	1,194
Equity earnings, before income tax:	133	134	418	436
Pretax income	$ 456	$ 299	$ 2,593	$ 1,630
Effective income tax rate (as a percent)	(11.00%)	7.00%	19.00%	27.00%
San Diego Gas and Electric Company
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ (15)	$ 35	$ (4)	$ 141
Income before income taxes and equity earnings	$ 259	$ 306	$ 712	$ 822
Effective income tax rate (as a percent)	(6.00%)	11.00%	(1.00%)	17.00%
Southern California Gas Company
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ (5)	$ (28)	$ 68	$ 75
Income before income taxes and equity earnings	$ 11	$ (110)	$ 600	$ 415
Effective income tax rate (as a percent)	(45.00%)	25.00%	11.00%	18.00%