Commitments and Contingencies (Accrual roll forward) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Loss contingency accrual roll forward
Wildfire-related claims, current	$ 150		$ 150		$ 121
Wildfire-related claims, non-current	1,583		1,583		1,687
2017/2018 Wildfire/Mudslide Events
Loss contingency accrual roll forward
Balance, beginning			1,119
Increase in accrued estimated losses	475	$ 880	565	$ 1,296
Amounts paid			(747)
Balance, end	937		937		1,119
Wildfire-related claims, current	150		150		121
Wildfire-related claims, non-current	1,583		1,583		1,687
2017/2018 Wildfire/Mudslide Events | SED Settlement
Loss contingency accrual roll forward
Wildfire-related claims, current	6		6		56
Wildfire-related claims, non-current	59		59		64
2017/2018 Wildfire/Mudslide Events | Settled Litigation
Loss contingency accrual roll forward
Wildfire-related claims, current	144		144		65
2017/2018 Wildfire/Mudslide Events | Estimated Losses for Remaining Alleged and Potential Claims
Loss contingency accrual roll forward
Wildfire-related claims, non-current	728		728		934
Other Wildfire Related Claims
Loss contingency accrual roll forward
Wildfire-related claims, non-current	796		796		689
Post-2018 Wildfires
Loss contingency accrual roll forward
Balance, beginning			682
Increase in accrued estimated losses	118	415	124	565
Amounts paid			(16)
Balance, end	790		790		682
SCE
Loss contingency accrual roll forward
Wildfire-related claims, current	150		150		121
Wildfire-related claims, non-current	1,583		1,583		$ 1,687
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation
Loss contingency accrual roll forward
Balance, end	209		209
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation | SED Settlement
Loss contingency accrual roll forward
Balance, end	65		65
SCE | 2017/2018 Wildfire/Mudslide Events | Estimated Losses for Remaining Alleged and Potential Claims
Loss contingency accrual roll forward
Balance, end	728		728
SCE | Post-2018 Wildfires
Loss contingency accrual roll forward
Increase in accrued estimated losses	$ 118	$ 415	$ 124	$ 565