SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - WILDFIRE FUND (Details) - USD ($)		12 Months Ended
	Jul. 12, 2019	Dec. 31, 2019	Jul. 25, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Liquidity fund, maximum borrowing capacity	$ 10,500,000,000
Initial shareholder contributions	7,500,000,000
Additional annual contributions, aggregate value	$ 3,000,000,000
Period of annual contributions	10 years
Noncurrent portion of the Wildfire Fund asset		$ 392,000,000		$ 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	20.00%
Initial liability cap	$ 900,000,000
Initial shareholder contributions	322,500,000
Additional annual contributions, aggregate value	129,000,000
Period of annual contributions		9 years
Wildfire fund asset			$ 451,500,000
Amortization of wildfire fund asset		15 years
Current portion of Wildfire fund		$ 29,000,000
Noncurrent portion of the Wildfire Fund asset		392,000,000		$ 0
Wildfire fund, liability			$ 451,500,000
Additional annual contributions		12,900,000
Wildfire fund obligations in current liabilities		12,900,000
Wildlife fund obligations in deferred credits and other		$ 86,000,000
San Diego Gas and Electric Company [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Fire risk mitigation capital improvements	215,000,000
Wildfire Fund [Member]
Loss Contingencies [Line Items]
Liquidity fund, maximum borrowing capacity	10,500,000,000
PG&E [Member]
Loss Contingencies [Line Items]
Initial shareholder contributions	4,800,000,000
Additional annual contributions, aggregate value	1,900,000,000
Edison [Member]
Loss Contingencies [Line Items]
Initial shareholder contributions	2,400,000,000
Additional annual contributions, aggregate value	945,000,000
SDG&E and Edison [Member]
Loss Contingencies [Line Items]
Total shareholder contribution	$ 3,800,000,000