Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 17,789	$ 15,949	$ 15,496
Pension and PBOP - net loss:
Other comprehensive income, net of tax	43	15
Ending Balance	17,522	17,789	15,949
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(54)	(69)	(69)
Pension and PBOP - net loss:
Other comprehensive income, net of tax	43	15
Ending Balance	(11)	(54)	(69)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Other comprehensive income before reclassifications	35	7
Reclassified from accumulated other comprehensive loss1	8	8
Other comprehensive income, net of tax	43	15
SCE
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	19,835	18,650	17,827
Pension and PBOP - net loss:
Other comprehensive income, net of tax	24	9	(2)
Ending Balance	20,789	19,835	18,650
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(32)	(41)	(39)
Pension and PBOP - net loss:
Other comprehensive income, net of tax	24	9	(2)
Ending Balance	(8)	(32)	$ (41)
SCE | Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Other comprehensive income before reclassifications	17	4
Reclassified from accumulated other comprehensive loss1	7	5
Other comprehensive income, net of tax	$ 24	$ 9