Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 17,522	$ 17,789
Pension and PBOP - net loss:
Other comprehensive income, net of tax	2	2
Ending Balance	17,549	17,632
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(11)	(54)
Pension and PBOP - net loss:
Other comprehensive income, net of tax	2	2
Ending Balance	(9)	(52)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Reclassified from accumulated other comprehensive loss1		2
Foreign currency translation adjustments
Pension and PBOP - net loss:
Reclassified from accumulated other comprehensive loss1	2
SCE
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	20,789	19,835
Pension and PBOP - net loss:
Other comprehensive income, net of tax		1
Ending Balance	20,807	19,652
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8)	(32)
Pension and PBOP - net loss:
Other comprehensive income, net of tax		1
Ending Balance	$ (8)	(31)
SCE | Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Reclassified from accumulated other comprehensive loss1		$ 1