REGULATORY MATTERS - BILLING PRACTICES (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2019	Jan. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 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
Subsequent Event [Member] | San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
FERC Requirement To Maintain Common Equity Ratio At Or Above	10.60%
Base ROE	10.10%
Additional Bps	0.50%
Additional FERC revenues	$ 17,000,000