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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

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