Commitments and Contingencies (Expense summary) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Charge for wildfire-related claims		$ 630	$ 1,296
Expected revenue from CPUC and FERC customers		(37)	(76)
Total pre-tax charge		593	1,220
Income tax benefit		(165)	(341)
Total after-tax charge		428	879
Post-2018 Wildfires
Commitments and Contingencies
Charge for wildfire-related claims		184	572
Expected insurance recoveries		(147)	(390)
Expected revenue from CPUC and FERC customers		(2)	(162)
Total pre-tax charge		35	20
Income tax benefit		(10)	(6)
Total after-tax charge		25	14
SCE | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Charge for wildfire-related claims		630
Expected revenue from CPUC and FERC customers	$ (4)
Total pre-tax charge	61
Total after-tax charge	$ 44
SCE | Post-2018 Wildfires
Commitments and Contingencies
Charge for wildfire-related claims		184	572
Expected insurance recoveries		(149)	(399)
Expected revenue from CPUC and FERC customers		(2)	(162)
Total pre-tax charge		33	11
Income tax benefit		(9)	(3)
Total after-tax charge		$ 24	$ 8