REGULATORY MATTERS (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	24 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2019
San Diego Gas and Electric Company [Member] | General Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Refund of 2015 memorandum account, After-tax	$ 9
Liability Associated With Tracked Income Tax Expense Differences		$ 20
San Diego Gas and Electric Company [Member] | California Public Utilities Commission [Member] | Capital Structure, Common Equity [Member] | Cost of Capital [Member]
Public Utilities, General Disclosures [Line Items]
Return on equity		10.30%
San Diego Gas and Electric Company [Member] | Forecast [Member] | California Public Utilities Commission [Member] | Cost of Capital [Member]
Public Utilities, General Disclosures [Line Items]
Return on equity			10.20%
Southern California Gas Company [Member] | General Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Refund of 2015 memorandum account, After-tax	$ 12
Liability Associated With Tracked Income Tax Expense Differences		$ 41
Southern California Gas Company [Member] | California Public Utilities Commission [Member] | Capital Structure, Common Equity [Member] | Cost of Capital [Member]
Public Utilities, General Disclosures [Line Items]
Return on equity		10.10%
Southern California Gas Company [Member] | Forecast [Member] | California Public Utilities Commission [Member] | Cost of Capital [Member]
Public Utilities, General Disclosures [Line Items]
Return on equity			10.05%