SAN ONOFRE NUCLEAR GENERATING STATION - NARRATIVE (Details) - SDG&E - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Jointly Owned Utility Plant Interests [Line Items]
Nuclear liability insurance coverage, maximum	$ 500
Secondary financial protection, maximum	60
Secondary financial protection, company contribution, annual maximum	560
Nuclear property damage insurance	130
Federal nuclear property damage insurance, minimum required	50
Nuclear property insurance terrorism coverage, maximum	$ 3,240
Jointly Owned Nuclear Power Plant
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share (as a percent)	20.00%
Percent of dismantlement work expense (as a percent)	20.00%
Decommissioning costs	$ 480
SONGS 2 and 3 Decommissioning
Jointly Owned Utility Plant Interests [Line Items]
Nuclear decommissioning trust authorized withdrawal amount		$ 79