REGULATORY MATTERS (Details) - USD ($) $ in Millions		9 Months Ended	24 Months Ended
	Oct. 06, 2017	Sep. 30, 2017	Dec. 31, 2019
San Diego Gas and Electric Company [Member] | General Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Liability Associated With Tracked Income Tax Expense Differences		$ 45
San Diego Gas and Electric Company [Member] | California Public Utilities Commission [Member] | Common Equity [Member] | Cost of Capital [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base		10.30%
San Diego Gas and Electric Company [Member] | Forecast [Member] | California Public Utilities Commission [Member] | Common Equity [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base			10.20%
San Diego Gas and Electric Company [Member] | Forecast [Member] | California Public Utilities Commission [Member] | Common Equity [Member] | Cost of Capital [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base			10.20%
Southern California Gas Company [Member] | General Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Liability Associated With Tracked Income Tax Expense Differences		$ 58
Southern California Gas Company [Member] | California Public Utilities Commission [Member] | Common Equity [Member] | Cost of Capital [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base		10.10%
Southern California Gas Company [Member] | Forecast [Member] | California Public Utilities Commission [Member] | Common Equity [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base			10.05%
Southern California Gas Company [Member] | Forecast [Member] | California Public Utilities Commission [Member] | Common Equity [Member] | Cost of Capital [Member]
Public Utilities, General Disclosures [Line Items]
Return on rate base			10.05%
Subsequent Event [Member] | San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
Revenue requirement requested	$ 2,199
Revenue requirement adjustment requested	218
Subsequent Event [Member] | Southern California Gas Company [Member]
Public Utilities, General Disclosures [Line Items]
Revenue requirement requested	2,989
Revenue requirement adjustment requested	$ 480
Minimum [Member] | San Diego Gas and Electric Company [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Percent revenue requirement adjustment expected	5.00%
Minimum [Member] | Southern California Gas Company [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Percent revenue requirement adjustment expected	6.00%
Maximum [Member] | San Diego Gas and Electric Company [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Percent revenue requirement adjustment expected	7.00%
Maximum [Member] | Southern California Gas Company [Member] | Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Percent revenue requirement adjustment expected	8.00%