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%
Return on rate base, revised	8.95%
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%
Return on rate base, revised	12.38%
Authorized weighting, proposed		52.00%
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%
Authorized weighting, proposed		52.00%
Minimum [Member] | San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base, proposed		6.62%
Minimum [Member] | San Diego Gas and Electric Company [Member] | Common Equity [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate, proposed		8.49%
Minimum [Member] | Southern California Gas Company [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base, proposed		6.45%
Minimum [Member] | Southern California Gas Company [Member] | Common Equity [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate, proposed		8.49%
Maximum [Member] | San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base, proposed		7.22%
Maximum [Member] | San Diego Gas and Electric Company [Member] | Common Equity [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate, proposed		9.65%
Maximum [Member] | Southern California Gas Company [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base, proposed		6.72%
Maximum [Member] | Southern California Gas Company [Member] | Common Equity [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate, proposed		9.63%