Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 17,675	$ 17,632	$ 17,789	$ 17,313	$ 17,223	$ 15,949	$ 17,789	$ 15,949
Pension and PBOP - net loss:
Other comprehensive income, net of tax	1	4	2	2	2	2	7	6
Ending balance	17,293	17,675	17,632	16,742	17,313	17,223	17,293	16,742
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(48)	(52)	(54)	(65)	(67)	(69)	(54)	(69)
Pension and PBOP - net loss:
Other comprehensive income, net of tax	1	4	2	2	2	2
Ending balance	(47)	(48)	(52)	(63)	(65)	(67)	(47)	(63)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Reclassified from accumulated other comprehensive loss	1			2			7	6
Other comprehensive income, net of tax	1			2			7	6
SCE
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	20,337	19,652	19,835	19,887	19,522	18,650	19,835	18,650
Pension and PBOP - net loss:
Other comprehensive income, net of tax	1	3	1	2	1	2	5	5
Ending balance	19,936	20,337	19,652	19,368	19,887	19,522	19,936	19,368
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(28)	(31)	(32)	(38)	(39)	(41)	(32)	(41)
Pension and PBOP - net loss:
Other comprehensive income, net of tax	1	3	1	2	1	2
Ending balance	(27)	$ (28)	$ (31)	(36)	$ (38)	$ (39)	(27)	(36)
SCE | Accumulated Defined Benefit Plans Adjustment
Pension and PBOP - net loss:
Reclassified from accumulated other comprehensive loss	1			2			5	5
Other comprehensive income, net of tax	$ 1			$ 2			$ 5	$ 5