Commitments and Contingencies (Accrual rollforward) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Loss contingency accrual roll forward
Wildfire-related claims, current	$ 39		$ 39		$ 30
Wildfire-related claims, non-current	1,055		1,055		1,368
2017/2018 Wildfire/Mudslide Events
Loss contingency accrual roll forward
Balance, beginning			715
Increase in accrued estimated losses		$ 475	490	$ 565
Amounts paid			(636)
Balance, end	569		569		715
Wildfire-related claims, non-current	491		491		637
2017/2018 Wildfire/Mudslide Events | SED Settlement
Loss contingency accrual roll forward
Wildfire-related claims, current	15		15		14
Wildfire-related claims, non-current	43		43		48
2017/2018 Wildfire/Mudslide Events | Settled Litigation
Loss contingency accrual roll forward
Wildfire-related claims, current	20		20		16
Other Wildfires
Loss contingency accrual roll forward
Balance, beginning			683
Increase in accrued estimated losses	4	118	184	124
Amounts paid			(342)
Balance, end	525		525		683
Wildfire-related claims, current	4		4
Wildfire-related claims, non-current	521		521		683
SCE
Loss contingency accrual roll forward
Wildfire-related claims, current	39		39		30
Wildfire-related claims, non-current	1,055		1,055		$ 1,368
SCE | 2017/2018 Wildfire/Mudslide Events | SED Settlement
Loss contingency accrual roll forward
Balance, beginning
Balance, end	58		58
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation
Loss contingency accrual roll forward
Balance, beginning
Balance, end	78		78
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation | SED Settlement
Loss contingency accrual roll forward
Balance, beginning
Balance, end	58		58
SCE | 2017/2018 Wildfire/Mudslide Events | Remaining Alleged and Potential Claims
Loss contingency accrual roll forward
Balance, beginning
Balance, end	491		491
SCE | Other Wildfires
Loss contingency accrual roll forward
Increase in accrued estimated losses	4	$ 118	184	$ 124
SCE | Other Wildfires | Remaining Alleged and Potential Claims
Loss contingency accrual roll forward
Balance, beginning
Balance, end	$ 521		$ 521