GENERAL INFORMATION AND OTHER FINANCIAL DATA - WILDFIRE FUND (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
Current portion of the Wildfire Fund asset		$ 29.0		$ 29.0		$ 29.0
Noncurrent portion of the Wildfire Fund asset		371.0		371.0		392.0	[1]
Wildfire Fund obligation in other current liabilities		13.0		13.0		13.0
Wildfire Fund obligation in deferred credits and other		87.0		87.0		86.0
Wildfire fund asset, amortization expense		7.0	$ 8.0	21.0	$ 8.0
Wildfire fund obligation, accretion expense		0.0	0.0	$ 1.0	0.0
San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Wildfire Fund asset			451.5		451.5
Estimated period of benefit				15 years
Wildfire fund, annual contributions				$ 12.9
Current portion of the Wildfire Fund asset		29.0		29.0		29.0
Noncurrent portion of the Wildfire Fund asset		371.0		371.0		392.0	[1]
Wildfire Fund obligation in other current liabilities		13.0		13.0		13.0
Wildfire Fund obligation in deferred credits and other		87.0		87.0		$ 86.0
Wildfire fund asset, amortization expense		7.0	8.0	21.0	8.0
Wildfire fund obligation, accretion expense		$ 0.0	$ 0.0	$ 1.0	$ 0.0
San Diego Gas and Electric Company [Member] | PG&E [Member]
Loss Contingencies [Line Items]
Wildfire fund, amount	$ 21,000.0

[1] Derived from audited financial statements.