REGULATORY MATTERS - COST OF CAPITAL & FERC RATES (Details) - USD ($) $ in Millions			1 Months Ended			12 Months Ended		36 Months Ended
	Jan. 01, 2020	Oct. 31, 2019	Jan. 31, 2020	Oct. 31, 2019	Apr. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2022	Jan. 01, 2019
California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
CCM Benchmark Rate, Increase (Decrease) Percent For Trigger						1.00%
San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
Minimum common equity ratio		10.60%		10.60%					11.20%
FERC Requirement To Maintain Common Equity Ratio At Or Above, Base		10.10%		10.10%
FERC, Revenue Requirement				$ 17
FERC requirement, additional basis spread		0.50%
San Diego Gas and Electric Company [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Weighted return on rate base					7.55%
CCM Benchmark Rate						4.491%
San Diego Gas and Electric Company [Member] | Federal Energy Regulatory Commission [Member]
Public Utilities, General Disclosures [Line Items]
Weighting						100.00%
Weighted return on rate base						7.51%
San Diego Gas and Electric Company [Member] | Capital Structure, Long Term Debt [Member] | Federal Energy Regulatory Commission [Member]
Public Utilities, General Disclosures [Line Items]
Weighting						43.44%
Return on rate base						4.21%
Weighted return on rate base						1.83%
San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting					52.00%
Return on rate base					10.20%
San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | Federal Energy Regulatory Commission [Member]
Public Utilities, General Disclosures [Line Items]
Weighting						56.56%
Return on rate base						10.05%	10.05%
Weighted return on rate base						5.68%
Southern California Gas Company [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Weighted return on rate base					7.34%
CCM Benchmark Rate						4.024%
Southern California Gas Company [Member] | Capital Structure, Common Equity [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting					52.00%
Return on rate base					10.05%
Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Weighted return on rate base	10.03%
Cost Of Capital Authorized Return On Rate Base, Revised	8.95%
Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Capital Structure, Preferred Stock [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting			6.22%
Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting	56.00%
Return on rate base	14.30%
Cost Of Capital Authorized Rate Of Recovery, Revised	12.38%
Subsequent Event [Member] | Southern California Gas Company [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Weighted return on rate base	7.85%
Subsequent Event [Member] | Southern California Gas Company [Member] | Capital Structure, Common Equity [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting	56.00%
Return on rate base	10.70%
Forecast [Member] | San Diego Gas and Electric Company [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting								100.00%
Weighted return on rate base								7.55%
Forecast [Member] | San Diego Gas and Electric Company [Member] | Capital Structure, Long Term Debt [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting								45.25%
Return on rate base								4.59%
Weighted return on rate base								2.08%
Forecast [Member] | San Diego Gas and Electric Company [Member] | Capital Structure, Preferred Stock [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting								2.75%
Return on rate base								6.22%
Weighted return on rate base								0.17%
Forecast [Member] | San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting								52.00%
Return on rate base								10.20%
Weighted return on rate base								5.30%
Forecast [Member] | Southern California Gas Company [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting								100.00%
Weighted return on rate base								7.30%
Forecast [Member] | Southern California Gas Company [Member] | Capital Structure, Long Term Debt [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting								45.60%
Return on rate base								4.23%
Weighted return on rate base								1.93%
Forecast [Member] | Southern California Gas Company [Member] | Capital Structure, Preferred Stock [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting								2.40%
Return on rate base								6.00%
Weighted return on rate base								0.14%
Forecast [Member] | Southern California Gas Company [Member] | Capital Structure, Common Equity [Member] | California Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Authorized weighting								52.00%
Return on rate base								10.05%
Weighted return on rate base								5.23%