GENERAL INFORMATION AND OTHER FINANCIAL DATA - WILDFIRE FUND (Details) - USD ($)		1 Months Ended	9 Months Ended
	Jul. 12, 2019	Aug. 31, 2019	Sep. 30, 2019	Jul. 25, 2019	Dec. 31, 2018	[1]
Loss Contingencies [Line Items]
Potential initial funded amount by loan	$ 10,500,000,000
Initial shareholder contributions	7,500,000,000
Aggregate value of annual shareholder contributions	$ 3,000,000,000
Period of annual contributions	10 years
Noncurrent portion of the Wildfire Fund asset			$ 381,000,000		$ 0
San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Wildfire fund, threshold amount to seek payment	$ 1,000,000,000
Wildfire fund, threshold percentage of equity portion of electric transmission and distribution rate base	20.00%
initial liability cap	$ 825,000,000
Initial shareholder contributions	322,500,000
Aggregate value of annual shareholder contributions	129,000,000
Period of annual contributions			10 years
Wildfire Fund asset				$ 451,500,000
Current portion of the Wildfire Fund asset			$ 43,000,000
Estimated period of benefit			10 years
Noncurrent portion of the Wildfire Fund asset			$ 381,000,000		$ 0
Wildfire Fund obligation				$ 451,500,000
Additional annual contributions			12,900,000
Wildfire Fund obligation in other current liabilities			12,900,000
Wildfire Fund obligation in deferred credits and other			$ 97,000,000
Wildfire Fund [Member]
Loss Contingencies [Line Items]
Potential initial funded amount by loan	10,500,000,000
Loan proceeds received		$ 2,000,000,000
PG&E [Member]
Loss Contingencies [Line Items]
Initial shareholder contributions	4,800,000,000
Aggregate value of annual shareholder contributions	1,900,000,000
Edison [Member]
Loss Contingencies [Line Items]
Initial shareholder contributions	2,400,000,000
Aggregate value of annual shareholder contributions	945,000,000
SDG&E and Edison [Member]
Loss Contingencies [Line Items]
Total Shareholder Contribution	3,800,000,000
Minimum [Member] | San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Fire risk mitigation capital improvements	$ 215,000,000

[1] Derived from audited financial statements.