Commitments and Contingencies (Wildfire loss expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Charge for wildfire-related claims	$ 1,296	$ 1,265
Expected revenue from CPUC and FERC customers	(76)	(67)
Total pre-tax charge	1,220	1,198
Income tax benefit	(341)	(304)
Total after-tax charge	879	894
Post-2018 Wildfires
Commitments and Contingencies
Charge for wildfire-related claims	572	7
Expected insurance recoveries	(390)
Expected revenue from CPUC and FERC customers	(162)
Total pre-tax charge	20	7
Income tax benefit	(6)	(2)
Total after-tax charge	14	5
SCE | Post-2018 Wildfires
Commitments and Contingencies
Charge for wildfire-related claims	572	7
Expected insurance recoveries	(399)
Expected revenue from CPUC and FERC customers	(162)
Total pre-tax charge	11	7
Income tax benefit	(3)	(2)
Total after-tax charge	8	$ 5
SCE | Post-2018 Wildfires | Wildfire expense memorandum account
Commitments and Contingencies
Expected revenue from CPUC and FERC customers	152
SCE | Post-2018 Wildfires | FERC balancing accounts
Commitments and Contingencies
Expected revenue from CPUC and FERC customers	$ 14