GENERAL INFORMATION AND OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense	$ 80	$ 139	$ 414	$ 297
Income before income taxes and equity earnings	364	281	1,029	1,049
Equity earnings, before income tax:	159	185	302	320
Pretax income	$ 523	$ 466	$ 1,331	$ 1,369
Effective income tax rate (as a percent)	15.00%	30.00%	31.00%	22.00%
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	42	$ 33	106	$ 78
Income before income taxes and equity earnings	$ 218	$ 219	$ 516	$ 476
Effective income tax rate (as a percent)	19.00%	15.00%	21.00%	16.00%
Southern California Gas Company
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense	$ 19	$ 8	$ 103	$ 102
Income before income taxes and equity earnings	107	103	525	604
Pretax income	$ 107	$ 103	$ 525	$ 604
Effective income tax rate (as a percent)	18.00%	8.00%	20.00%	17.00%