REGULATORY MATTERS - BILLING PRACTICES (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Public Utilities, General Disclosures [Line Items]
Penalties related to billing practices OII		$ 0	$ 0	$ 8,000,000	$ 0
San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
FERC Requirement To Maintain Common Equity Ratio At Or Above						11.20%	10.05%
Southern California Gas Company [Member]
Public Utilities, General Disclosures [Line Items]
Penalties related to billing practices OII	$ 8,000,000	$ 0	$ 0	$ 8,000,000	$ 0
Penalties related to billing practives, payable to general fund	3,000,000
Total amount penalties credited to customers	$ 5,000,000
Number of days that customers bills were delayed	45 days
Penalty credit per customer	$ 100