COMMITMENTS AND CONTINGENCIES - OPERATING LEASES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Annual Rent Escalation [Abstract]
Minimum annual rent escalation	2.00%
Maximum annual rent escalation	5.00%
Operating Leases, Rent Expense, Net [Abstract]
Rent expense	$ 123	$ 109	$ 77
Future minimum lease payments
2019	79
2020	56
2021	54
2022	51
2023	44
Thereafter	259
Total	543
Future estimated rental payments
2019	12
2020	12
2021	13
2022	13
2023	13
Thereafter	44
Total	107
Total future rental commitments
2019	91
2020	68
2021	67
2022	64
2023	57
Thereafter	303
Total	650
Utility Subsidiaries [Member]
Operating Leases, Annual Rent Escalation [Abstract]
Aggregate maximum lease limit	201
Lease limit utilized	$ 130
San Diego Gas and Electric Company [Member]
Operating Leases, Annual Rent Escalation [Abstract]
Minimum annual rent escalation	2.00%
Maximum annual rent escalation	5.00%
Operating Leases, Rent Expense, Net [Abstract]
Rent expense	$ 27	28	28
Future minimum lease payments
2019	23
2020	22
2021	22
2022	21
2023	17
Thereafter	48
Total	153
Future estimated rental payments
2019	2
2020	2
2021	2
2022	2
2023	2
Thereafter	7
Total	17
Total future rental commitments
2019	25
2020	24
2021	24
2022	23
2023	19
Thereafter	55
Total	$ 170
Southern California Gas Company [Member]
Operating Leases, Annual Rent Escalation [Abstract]
Minimum annual rent escalation	2.00%
Maximum annual rent escalation	5.00%
Operating Leases, Rent Expense, Net [Abstract]
Rent expense	$ 41	$ 43	$ 38
Future minimum lease payments
2019	26
2020	22
2021	21
2022	20
2023	16
Thereafter	28
Total	133
Future estimated rental payments
2019	10
2020	10
2021	11
2022	11
2023	11
Thereafter	37
Total	90
Total future rental commitments
2019	36
2020	32
2021	32
2022	31
2023	27
Thereafter	65
Total	$ 223