REGULATORY MATTERS - COST OF CAPITAL (Details) - California Public Utilities Commission [Member]	3 Months Ended	24 Months Ended
	Mar. 31, 2018	Dec. 31, 2019
San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
Return On Rate Base	7.79%
Cost of debt	5.00%
San Diego Gas and Electric Company [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting		100.00%
Return On Rate Base		7.55%
Cost of debt		4.59%
Difference between current cost of capital and proposed cost of capital		(0.41%)
Difference between current return on rate base and proposed return on rate base		(0.24%)
San Diego Gas and Electric Company [Member] | Long Term Debt [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting		45.25%
Return on rate base		4.59%
Weighted return on rate base		2.08%
San Diego Gas and Electric Company [Member] | Preferred Stock [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting		2.75%
Return on rate base		6.22%
Weighted return on rate base		0.17%
San Diego Gas and Electric Company [Member] | Common Equity [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting		52.00%
Return on rate base		10.20%
Weighted return on rate base		5.30%
Southern California Gas Company [Member]
Public Utilities, General Disclosures [Line Items]
Return On Rate Base	8.02%
Cost of debt	5.77%
Southern California Gas Company [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting		100.00%
Return On Rate Base		7.34%
Cost of debt		4.33%
Difference between current cost of capital and proposed cost of capital		(1.44%)
Difference between current return on rate base and proposed return on rate base		(0.68%)
Southern California Gas Company [Member] | Long Term Debt [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting		45.60%
Return on rate base		4.33%
Weighted return on rate base		1.97%
Southern California Gas Company [Member] | Preferred Stock [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting		2.40%
Return on rate base		6.00%
Weighted return on rate base		0.14%
Southern California Gas Company [Member] | Common Equity [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting		52.00%
Return on rate base		10.05%
Weighted return on rate base		5.23%