Commitments and Contingencies (Accrual rollforward) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Loss contingency accrual roll forward
Wildfire-related claims, current	$ 160		$ 30
Wildfire-related claims, non-current	1,657		1,368
2017/2018 Wildfire/Mudslide Events
Loss contingency accrual roll forward
Balance, beginning	715
Increase in accrued estimated losses	490	$ 90
Amounts paid	(174)
Balance, end	1,031		715
Wildfire-related claims, non-current	831		637
2017/2018 Wildfire/Mudslide Events | SED Settlement
Loss contingency accrual roll forward
Wildfire-related claims, current	14		14
Wildfire-related claims, non-current	46		48
2017/2018 Wildfire/Mudslide Events | Settled Litigation
Loss contingency accrual roll forward
Wildfire-related claims, current	140		16
Other Wildfires
Loss contingency accrual roll forward
Balance, beginning	683
Increase in accrued estimated losses	180	6
Amounts paid	(77)
Balance, end	786		683
Wildfire-related claims, current	6
Wildfire-related claims, non-current	780		683
SCE
Loss contingency accrual roll forward
Wildfire-related claims, current	160		30
Wildfire-related claims, non-current	1,657		$ 1,368
SCE | 2017/2018 Wildfire/Mudslide Events
Loss contingency accrual roll forward
Increase in accrued estimated losses	490
SCE | 2017/2018 Wildfire/Mudslide Events | SED Settlement
Loss contingency accrual roll forward
Balance, end	60
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation
Loss contingency accrual roll forward
Balance, end	200
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation | SED Settlement
Loss contingency accrual roll forward
Balance, end	60
SCE | 2017/2018 Wildfire/Mudslide Events | Remaining Alleged and Potential Claims
Loss contingency accrual roll forward
Balance, end	831
SCE | Other Wildfires
Loss contingency accrual roll forward
Increase in accrued estimated losses	180	$ 6
Balance, end	$ 780