Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax
Beginning balance	$ 17,522	$ 17,789	$ 15,949
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	2	43	15
Ending Balance	17,944	17,522	17,789
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax
Beginning balance	(11)	(54)	(69)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	2	43	15
Ending Balance	(9)	(11)	(54)
Accumulated Defined Benefit Plans Adjustment
Changes in accumulated other comprehensive loss
Other comprehensive (loss) income before reclassifications	(2)	35
Reclassified from accumulated other comprehensive loss1	1	8
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss
Other comprehensive (loss) income before reclassifications	(3)
SCE
AOCI Attributable to Parent, Net of Tax
Beginning balance	20,789	19,835	18,650
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	(4)	24	9
Ending Balance	21,404	20,789	19,835
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax
Beginning balance	(8)	(32)	(41)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax	(4)	24	9
Ending Balance	(12)	(8)	$ (32)
SCE | Accumulated Defined Benefit Plans Adjustment
Changes in accumulated other comprehensive loss
Other comprehensive (loss) income before reclassifications	(5)	17
Reclassified from accumulated other comprehensive loss1	$ 1	$ 7