Commitments and Contingencies (Wildfires) (Details) $ in Millions	1 Months Ended			2 Months Ended	3 Months Ended						9 Months Ended		12 Months Ended
	Oct. 31, 2021 USD ($)	Jan. 31, 2021 $ / claim	Oct. 31, 2020 USD ($)	Apr. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2020 $ / claim	Dec. 31, 2019 USD ($)	Sep. 30, 2023 USD ($) plaintiff	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Increase (decrease) in estimated loss					$ 475
Expected revenue through electric rates					27			$ 50			$ 33	$ 76
Total after-tax charge					323			598			384	879
Payments											747
Charge for wildfire-related claims					937						937		$ 1,119
Total pre-tax charge					448			830			532	1,220
Increase in accrued estimated losses					475			880			$ 565	1,296
2017/2018 Wildfire/Mudslide Events | Individual Plaintiff Settlements
Commitments and Contingencies
Number of plaintiffs | plaintiff											2,000
Post-2018 Wildfires
Commitments and Contingencies
Increase (decrease) in estimated loss											$ 124
Expected revenue through electric rates								162				162
Total after-tax charge					5			6			9	14
Payments											16
Charge for wildfire-related claims					790						790		682
Total pre-tax charge					7			9			13	20
Increase in accrued estimated losses					118			415			124	565
SCE
Commitments and Contingencies
Regulatory Assets					11,182						11,182		10,678
SCE | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Expected revenue through electric rates					27
Regulatory Assets					51						51
SCE | 2017/2018 Wildfire/Mudslide Events | SED Settlement
Commitments and Contingencies
Charge for wildfire-related claims	$ 550
Fine to State	110
Shareholder-funded safety measures costs	65
Third-party uninsured claims cost recovery waiver	$ 375
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
SCE | 2017/2018 Wildfire/Mudslide Events | Individual Plaintiff Settlements
Commitments and Contingencies
Payments					316	$ 278	$ 148						$ 1,700	$ 1,700	$ 300
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation
Commitments and Contingencies
Charge for wildfire-related claims					209						209
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation | SED Settlement
Commitments and Contingencies
Charge for wildfire-related claims					65						65
SCE | 2017/2018 Wildfire/Mudslide Events | Estimated Losses for Remaining Alleged and Potential Claims
Commitments and Contingencies
Charge for wildfire-related claims					728						728
SCE | 2017/2018 Wildfire/Mudslide Events | Aggregate
Commitments and Contingencies
Expected revenue through electric rates											409
Payments											8,400
Increase in accrued estimated losses											$ 9,300
SCE | 2017/2018 Wildfire/Mudslide Events | Aggregate | Individual Plaintiff Settlements
Commitments and Contingencies
Number of plaintiffs | plaintiff											11,000
SCE | November 2018 Wildfires | Woolsey Subrogation Settlement
Commitments and Contingencies
Payments				$ 2,200
Payment agreement for each dollar of claim | $ / claim		0.67
SCE | Post-2018 Wildfires
Commitments and Contingencies
Expected revenue through electric rates								162				162
Total after-tax charge					3						$ 7	8
Regulatory Assets					166						166
Total pre-tax charge					4						10	11
Increase in accrued estimated losses					118			$ 415			124	$ 565
Expected insurance recoveries					$ 560						560
SCE | Post-2018 Wildfires | Aggregate
Commitments and Contingencies
Expected revenue through electric rates											166
Total after-tax charge											48
Payments											30
Increase in accrued estimated losses											820
SCE | Post-2018 Wildfires | Aggregate | CPUC
Commitments and Contingencies
Expected revenue through electric rates											152
SCE | Post-2018 Wildfires | Aggregate | FERC
Commitments and Contingencies
Expected revenue through electric rates											$ 14