Accumulated Other Comprehensive Loss - SCE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax
Beginning balance	$ 15,565
Pension and PBOP:
Other comprehensive income, net of tax	0	$ 0
Ending balance	16,622
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Pension and PBOP:
Reclassified from accumulated other comprehensive loss	0	0
SCE
AOCI Attributable to Parent, Net of Tax
Beginning balance	21,751	21,404
Pension and PBOP:
Other comprehensive income, net of tax	0	1
Ending balance	22,875	21,097
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax
Beginning balance	(9)	(12)
Pension and PBOP:
Other comprehensive income, net of tax		1
Ending balance	(9)	(11)
SCE | Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Pension and PBOP:
Reclassified from accumulated other comprehensive loss	$ 0	$ 1