Total Estimated Nuclear Decommissioning Costs, Latest Cost Study Escalated.

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Increase (Decrease) In Operation And Maintenance Cost Balancing Account.

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The increase (decrease) during the reporting period in the asset created by the regulatory convention in which costs and revenues associated with certain utility expenses (such as fuel) are accumulated but on which no return is earned.

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The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.

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Amount of damages awarded to the plaintiff in the legal matter.

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Cash received for the settlement of litigation during the current period.

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SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) - ASSET RETIREMENT OBLIGATION AND SPENT NUCLEAR FUEL (Details) - USD ($) $ in Millions		1 Months Ended			12 Months Ended
	Apr. 18, 2016	Jul. 31, 2018	May 31, 2017	May 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Jointly Owned Utility Plant Interests [Line Items]
Decrease in regulatory balancing account					$ (263)	$ (108)	$ (198)
San Diego Gas and Electric Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Decommissioning liability					626
Cost study estimate decommissioning escalated					810
Decrease in regulatory balancing account					$ (138)	$ (56)	$ (35)
San Diego Gas and Electric Company [Member] \| Total Ownership [Member]
Jointly Owned Utility Plant Interests [Line Items]
Spent nuclear fuel damages awarded	$ 162
San Diego Gas and Electric Company [Member] \| San Onofre Nuclear Generating Station (SONGS) [Member]
Jointly Owned Utility Plant Interests [Line Items]
Spent nuclear fuel damages awarded				$ 32
Decrease in regulatory asset				(23)
Decrease in regulatory balancing account				(8)
Decrease in SONGS O&M cost balancing account				$ (1)
Proceeds from Legal Settlements		$ 9	$ 9