Summary of Significant Accounting Policies (Allowance) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for long-term uncollectible accounts	$ 7	$ 7	$ 116
SCE
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		309	188	$ 49
Included in operation and maintenance expenses in earning activities		82	44	45
Included in operation and maintenance expenses in cost-recovery activities		58	74	15
Deferred to regulatory memorandum accounts		(18)	17	105
Write-offs, net of recoveries		(77)	(14)	(26)
Ending balance	354	354	309	188
Allowance for long-term uncollectible accounts	7	7	116
SCE | CAPP
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Credit loss expense (reversal)	(83)
SCE | Customers
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		293	175	35
Included in operation and maintenance expenses in earning activities		71	33	36
Included in operation and maintenance expenses in cost-recovery activities		58	74	15
Deferred to regulatory memorandum accounts		(18)	17	105
Write-offs, net of recoveries		(70)	(6)	(16)
Ending balance	334	334	293	175
SCE | All others
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		16	13	14
Included in operation and maintenance expenses in earning activities		11	11	9
Write-offs, net of recoveries		(7)	(8)	(10)
Ending balance	$ 20	$ 20	$ 16	$ 13