INCOME TAXES - EFFECTS OF THE TAX CUTS AND JOBS ACT OF 2017 (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	35.00%
Decrease in net deferred income tax liabilities due to remeasurement			$ 16	$ (2,220)
Increase in net regulatory liabilities from remeasurement of deferred tax income tax assets and liabilities			33	2,402
Income tax expense, related to remeasurement of deferred income tax assets and liabilities			49	182
Income tax expense related to deemed repatriation			(8)	328
U.S. state and non-U.S. withholding tax expense, related to expected future repatriation of foreign earnings				109
Total increase in income tax expense			41	$ 619
Income tax benefit related to outside differences on plans to sell businesses		$ 89
Income tax expense related to increase in outside basis differences	$ 51
Foreign undistributed earnings	4,000	4,000
Undistributed earnings of foreign subsidiaries considered to be indefinitely reinvested	157	157
Foreign earnings repatriated		$ 254	$ 338
San Diego Gas and Electric Company [Member]
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	35.00%
Income tax expense recognized in current period, related to remeasurement of deferred income tax assets and liabilities		$ 31
Decrease in net deferred income tax liabilities due to remeasurement			$ (38)	$ (1,400)
Increase in net regulatory liabilities from remeasurement of deferred tax income tax assets and liabilities			38	1,428
Income tax expense, related to remeasurement of deferred income tax assets and liabilities			0	28
Income tax expense related to deemed repatriation			0	0
U.S. state and non-U.S. withholding tax expense, related to expected future repatriation of foreign earnings				0
Total increase in income tax expense			$ 0	$ 28
Southern California Gas Company [Member]
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	35.00%
Income tax expense recognized in current period, related to remeasurement of deferred income tax assets and liabilities		$ 38
Decrease in net deferred income tax liabilities due to remeasurement			$ 5	$ (972)
Increase in net regulatory liabilities from remeasurement of deferred tax income tax assets and liabilities			(5)	974
Income tax expense, related to remeasurement of deferred income tax assets and liabilities			0	2
Income tax expense related to deemed repatriation			0	0
U.S. state and non-U.S. withholding tax expense, related to expected future repatriation of foreign earnings				0
Total increase in income tax expense			$ 0	$ 2
Non-U.S. [Member]
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items]
Undistributed earnings of foreign subsidiaries considered to be indefinitely reinvested	$ 600	$ 600