Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 17,632	$ 17,789	$ 17,223	$ 15,949	$ 17,789	$ 15,949
Pension and PBOP - net loss:
Other comprehensive income, net of tax	4	2	2	2	6	4
Ending balance	17,675	17,632	17,313	17,223	17,675	17,313
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(52)	(54)	(67)	(69)	(54)	(69)
Pension and PBOP - net loss:
Other comprehensive income, net of tax	4	2	2	2
Ending balance	(48)	(52)	(65)	(67)	(48)	(65)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Reclassified from accumulated other comprehensive loss	4		2		6	4
Other comprehensive income, net of tax	4		2		6	4
SCE
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	19,652	19,835	19,522	18,650	19,835	18,650
Pension and PBOP - net loss:
Other comprehensive income, net of tax	3	1	1	2	4	3
Ending balance	20,337	19,652	19,887	19,522	20,337	19,887
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(31)	(32)	(39)	(41)	(32)	(41)
Pension and PBOP - net loss:
Other comprehensive income, net of tax	3	1	1	2
Ending balance	(28)	$ (31)	(38)	$ (39)	(28)	(38)
SCE | Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Reclassified from accumulated other comprehensive loss	3		1		4	3
Other comprehensive income, net of tax	$ 3		$ 1		$ 4	$ 3