Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax
Beginning balance	$ 17,868	$ 17,615	$ 17,944	$ 17,549	$ 17,522	$ 17,944	$ 17,522
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	2	1		1	2	3	3
Ending Balance	18,107	17,868	17,615	17,694	17,549	18,107	17,571
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax
Beginning balance	(8)	(9)	(9)	(9)	(11)	(9)	(11)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	2	1		1	2
Ending Balance	(6)	(8)	(9)	(8)	(9)	(6)	(8)
Accumulated Defined Benefit Plans Adjustment
Changes in accumulated other comprehensive loss
Reclassified from accumulated other comprehensive loss1	1					2	1
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss
Other comprehensive (loss) income before reclassifications	1					1	2
SCE
AOCI Attributable to Parent, Net of Tax
Beginning balance	21,262	21,097	21,404	20,807	20,789	21,404	20,789
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	1		1			2
Ending Balance	21,474	21,262	21,097	20,881	20,807	21,474	20,775
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax
Beginning balance	(11)	(11)	(12)	(8)	(8)	(12)	(8)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	1		1
Ending Balance	(10)	$ (11)	$ (11)	$ (8)	$ (8)	(10)	$ (8)
SCE | Accumulated Defined Benefit Plans Adjustment
Changes in accumulated other comprehensive loss
Reclassified from accumulated other comprehensive loss1	$ 1					$ 2