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Summary of Significant Accounting Policies (Uncollectible Allowance) (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 USD ($) | Jun. 30, 2021 D | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Gross long-term account receivables |  |  | $ 238 |
Allowance for long-term uncollectible accounts |  |  | 116 |
SCE |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | $ 309 |  | 188 | $ 49
Included in operation and maintenance expenses in earning activities |  |  | 44 | 45
Included in operation and maintenance expenses in cost-recovery activities |  |  | 74 | 15
Deferred to regulatory memorandum accounts |  |  | 17 | 105
Less: write-offs, net of recoveries |  |  | 14 | 26
Ending balance |  |  | 309 | 188
Number of arrearages days | D |  | 60 |  |
Term of payment plans |  | 24 months |  |
Allowance for long-term uncollectible accounts |  |  | 116 |
SCE | CAPP |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Less: write-offs, net of recoveries |  |  | 78 |
Cash received | 185 |  |  |
SCE | Customers |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 293 |  | 175 | 35
Included in operation and maintenance expenses in earning activities |  |  | 33 | 36
Included in operation and maintenance expenses in cost-recovery activities |  |  | 74 | 15
Deferred to regulatory memorandum accounts |  |  | 17 | 105
Less: write-offs, net of recoveries |  |  | 6 | 16
Ending balance |  |  | 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 | 9
Less: write-offs, net of recoveries |  |  | 8 | 10
Ending balance |  |  | $ 16 | $ 13

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