Commitments and Contingencies (Monetary) (Details) $ in Millions		1 Months Ended				3 Months Ended		12 Months Ended
	Apr. 23, 2024 plaintiff	Oct. 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Oct. 31, 2020 USD ($) $ / claim	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) $ / claim	Dec. 31, 2019 USD ($)
2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Increase in accrued estimated losses						$ 490	$ 90
Expected revenue through electric rates						27	6
Total after-tax charge						333	61
Payments						174
Charge for wildfire-related claims						1,031		$ 715
Other Wildfires
Commitments and Contingencies
Increase in accrued estimated losses						180	6
Expected revenue through electric rates						7
Total after-tax charge						85	4
Payments						77
Charge for wildfire-related claims						786		683
SCE
Commitments and Contingencies
Regulatory Assets						11,795		11,421
SCE | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Increase in accrued estimated losses						490
Expected revenue through electric rates						27
Total after-tax charge						333
Regulatory Assets						64
SCE | 2017/2018 Wildfire/Mudslide Events | SED Settlement
Commitments and Contingencies
Charge for wildfire-related claims		$ 550				60
Fine to State		110
Shareholder-funded safety measures costs		65
Third-party uninsured claims cost recovery waiver		$ 375
SCE | 2017/2018 Wildfire/Mudslide Events | Individual Plaintiff Settlements
Commitments and Contingencies
Payments						216		$ 876	$ 1,700	$ 1,700
Number of plaintiffs | plaintiff	1,300
SCE | 2017/2018 Wildfire/Mudslide Events | Local Public Entity Settlements
Commitments and Contingencies
Payments											$ 360
SCE | 2017/2018 Wildfire/Mudslide Events | TKM Subrogation Settlement
Commitments and Contingencies
Payments					$ 1,200
Payment agreement for each dollar of claim | $ / claim					0.555
Percentage of outstanding individual plaintiff claims	96.00%
SCE | 2017/2018 Wildfire/Mudslide Events | Woolsey Subrogation Settlement
Commitments and Contingencies
Percentage of outstanding individual plaintiff claims	88.00%
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation
Commitments and Contingencies
Charge for wildfire-related claims						200
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation | SED Settlement
Commitments and Contingencies
Charge for wildfire-related claims						60
SCE | 2017/2018 Wildfire/Mudslide Events | Remaining Alleged and Potential Claims
Commitments and Contingencies
Charge for wildfire-related claims						831
SCE | 2017/2018 Wildfire/Mudslide Events | Aggregate
Commitments and Contingencies
Increase in accrued estimated losses						9,900
Expected revenue through electric rates						440
Payments						8,800
SCE | 2017/2018 Wildfire/Mudslide Events | Aggregate | Individual Plaintiff Settlements
Commitments and Contingencies
Number of plaintiffs | plaintiff	13,000
SCE | November 2018-Woolsey | Woolsey Subrogation Settlement
Commitments and Contingencies
Payments			$ 2,200	$ 2,200
Payment agreement for each dollar of claim | $ / claim										0.67
SCE | Other Wildfires
Commitments and Contingencies
Increase in accrued estimated losses						180	6
Expected revenue through electric rates						7
Total after-tax charge						84	$ 4
Charge for wildfire-related claims						780
Expected insurance recovery asset						516
Regulatory Assets						156
SCE | Other Wildfires | Aggregate
Commitments and Contingencies
Increase in accrued estimated losses						1,100
Expected revenue through electric rates						175
Total after-tax charge						152
Payments						286
SCE | Other Wildfires | Aggregate | CPUC
Commitments and Contingencies
Expected revenue through electric rates						152
SCE | Other Wildfires | Aggregate | FERC
Commitments and Contingencies
Expected revenue through electric rates						23
SCE | 2017 Creek Fire
Commitments and Contingencies
Expected insurance recovery asset						$ 18