Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 17,549	$ 17,522	$ 17,675	$ 17,632	$ 17,789	$ 17,522	$ 17,789
Pension and PBOP - net loss:
Other comprehensive income, net of tax	1	2	1	4	2	3	7
Ending Balance	17,694	17,549	17,293	17,675	17,632	17,571	17,293
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(9)	(11)	(48)	(52)	(54)	(11)	(54)
Pension and PBOP - net loss:
Other comprehensive income, net of tax	1	2	1	4	2
Ending Balance	(8)	(9)	(47)	(48)	(52)	(8)	(47)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Reclassified from accumulated other comprehensive loss1			1			1	7
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	20,807	20,789	20,337	19,652	19,835	20,789	19,835
Pension and PBOP - net loss:
Other comprehensive income, net of tax			1	3	1		5
Ending Balance	20,881	20,807	19,936	20,337	19,652	20,775	19,936
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8)	(8)	(28)	(31)	(32)	(8)	(32)
Pension and PBOP - net loss:
Other comprehensive income, net of tax			1	3	1
Ending Balance	$ (8)	$ (8)	(27)	$ (28)	$ (31)	$ (8)	(27)
SCE | Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Reclassified from accumulated other comprehensive loss1			$ 1				$ 5