REGULATORY MATTERS - COST OF CAPITAL (Details) - Forecast [Member] - California Public Utilities Commission [Member]		24 Months Ended
	Jan. 01, 2020	Dec. 31, 2019
San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
Return On Rate Base	10.03%	7.55%
San Diego Gas and Electric Company [Member] | Common Equity [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting	56.00%	52.00%
Return on rate base	14.30%	10.20%
Premium for wildfire risk	3.40%
Southern California Gas Company [Member]
Public Utilities, General Disclosures [Line Items]
Return On Rate Base	7.85%	7.34%
Southern California Gas Company [Member] | Common Equity [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting	56.00%	52.00%
Return on rate base	10.70%	10.05%