Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax
Beginning balance	$ 17,944	$ 17,522	$ 17,789
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	9	2	43
Ending balance	17,740	17,944	17,522
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax
Beginning balance	(9)	(11)	(54)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	9	2	43
Ending balance	0	(9)	(11)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Changes in accumulated other comprehensive loss
Other comprehensive (loss) income before reclassifications	7	(2)
Reclassified from accumulated other comprehensive loss	2	1
Accumulated Foreign Currency Adjustment Attributable to Parent
Changes in accumulated other comprehensive loss
Other comprehensive (loss) income before reclassifications	0	3
SCE
AOCI Attributable to Parent, Net of Tax
Beginning balance	21,404	20,789	19,835
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	3	(4)	24
Ending balance	21,751	21,404	20,789
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax
Beginning balance	(12)	(8)	(32)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	3	(4)	24
Ending balance	(9)	(12)	$ (8)
SCE | Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Changes in accumulated other comprehensive loss
Other comprehensive (loss) income before reclassifications	1	(5)
Reclassified from accumulated other comprehensive loss	2	1
SCE | Accumulated Foreign Currency Adjustment Attributable to Parent
Changes in accumulated other comprehensive loss
Other comprehensive (loss) income before reclassifications	$ 0	$ 0