Commitments and Contingencies (Wildfire loss expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Charge for wildfire-related claims	$ 880.0	$ 1,265.0	$ 1,296.0	$ 1,265.0
Expected revenue from FERC customers	(50.0)	(67.0)	(76.0)	(67.0)
Total pre-tax charge	830.0	1,198.0	1,220.0	1,198.0
Income tax benefit	(232.0)	(304.0)	(341.0)	(304.0)
Total after-tax charge	598.0	894.0	879.0	894.0
Post-2018 Wildfires
Commitments and Contingencies
Charge for wildfire-related claims	415.0	5.0	565.0	7.0
Expected insurance recoveries	(244.0)		(383.0)
Expected revenue from FERC customers	(162.0)		(162.0)
Total pre-tax charge	9.0	5.0	20.0	7.0
Income tax benefit	(3.0)	(1.0)	(6.0)	(2.0)
Total after-tax charge	6.0	4.0	14.0	5.0
SCE | Post-2018 Wildfires
Commitments and Contingencies
Charge for wildfire-related claims	415.0	5.0	565.0	7.0
Expected insurance recoveries	(253.0)		(392.0)
Expected revenue from FERC customers	$ (162.0)		(162.0)
Total pre-tax charge		5.0	11.0	7.0
Income tax benefit		(1.0)	(3.0)	(2.0)
Total after-tax charge		$ 4.0	8.0	$ 5.0
SCE | Post-2018 Wildfires | Wildfire expense memorandum account
Commitments and Contingencies
Expected revenue from FERC customers			152.0
SCE | Post-2018 Wildfires | FERC balancing accounts
Commitments and Contingencies
Expected revenue from FERC customers			$ 10.0