INCOME TAXES - COMPONENTS OF INCOME TAX EXPENSE (BENEFIT) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S.	$ 1,191	$ (102)	$ 878
Non-U.S.	573	580	404
Pretax income	1,764	478	1,282
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	0	(1)	4
U.S. state	(14)	67	0
Non-U.S.	140	127	45
Total	126	193	49
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	87	(121)	566
U.S. state	21	(183)	154
Non-U.S.	84	66	169
Total	192	(238)	889
Deferred investment tax credits	(3)	(4)	0
Total income tax expense (benefit)	315	(49)	938
San Diego Gas and Electric Company [Member]
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Pretax income	945	849	576
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	35	104	100
U.S. state	31	30	65
Total	66	134	165
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	75	17	29
U.S. state	32	24	(41)
Total	107	41	(12)
Deferred investment tax credits	(2)	(2)	2
Total income tax expense (benefit)	171	173	155
Southern California Gas Company [Member]
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Pretax income	762	493	557
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	8	4	0
U.S. state	24	10	23
Total	32	14	23
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	79	78	144
U.S. state	10	2	(5)
Total	89	80	139
Deferred investment tax credits	(1)	(2)	(2)
Total income tax expense (benefit)	$ 120	$ 92	$ 160