Commitments and Contingencies (Expense summary) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Charge for wildfire-related claims	$ 475	$ 880	$ 565	$ 1,296
Expected revenue from CPUC and FERC customers	(27)	(50)	(33)	(76)
Total pre-tax charge	448	830	532	1,220
Income tax benefit	(125)	(232)	(148)	(341)
Total after-tax charge	323	598	384	879
Post-2018 Wildfires
Commitments and Contingencies
Charge for wildfire-related claims	118	415	124	565
Expected insurance recoveries	(111)	(244)	(111)	(383)
Expected revenue from CPUC and FERC customers		(162)		(162)
Total pre-tax charge	7	9	13	20
Income tax benefit	(2)	(3)	(4)	(6)
Total after-tax charge	5	6	9	14
SCE | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Expected revenue from CPUC and FERC customers	(27)
SCE | Post-2018 Wildfires
Commitments and Contingencies
Charge for wildfire-related claims	118	415	124	565
Expected insurance recoveries	(114)	(253)	(114)	(392)
Expected revenue from CPUC and FERC customers		$ (162)		(162)
Total pre-tax charge	4		10	11
Income tax benefit	(1)		(3)	(3)
Total after-tax charge	$ 3		$ 7	$ 8