GENERAL INFORMATION AND OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income Tax Expense (Benefit)	$ 47	$ (602)	$ 89	$ (360)
Income from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities	286	(1,183)	787	(590)
Equity (losses) earnings, before income tax	2	(189)	7	(184)
Pretax income (loss)	$ 288	$ (1,372)	$ 794	$ (774)
Effective income tax rate	16.00%	44.00%	11.00%	47.00%
Income tax expense related to outside basis differences existing prior to the January 25, 2019 approval of our plan to sell our South American businesses			$ 103
Income tax expense related to the increase in outside basis differences from 2019 earnings since January 25, 2019			20
San Diego Gas and Electric Company [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income Tax Expense (Benefit)	$ 35	$ 42	40	$ 98
Income from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities	181	188	363	413
Pretax income (loss)	$ 181	$ 188	$ 363	$ 413
Effective income tax rate	19.00%	22.00%	11.00%	24.00%
Income tax benefit for release of a regulatory liability			$ 31
Southern California Gas Company [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income Tax Expense (Benefit)	$ (4)	$ 23	15	$ 82
Income from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities	27	57	310	341
Pretax income (loss)	$ 27	$ 57	$ 310	$ 341
Effective income tax rate	(15.00%)	40.00%	5.00%	24.00%
Income tax benefit for release of a regulatory liability			$ 38