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Summary of Significant Accounting Policies (Uncollectible Allowance) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) D | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Gross long-term account receivables |  | $ 199 |  | $ 199 |
Allowance for long-term uncollectible accounts |  | 93 |  | 93 |
SCE |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  | 270 | $ 90 | 188 | $ 49
Included in operation and maintenance expenses in earning activities |  | 13 | 15 | 38 | 50
Included in operation and maintenance expenses in cost-recovery activities |  | 52 |  | 112 |
Deferred to regulatory memorandum accounts |  | 7 | 43 | 13 | 64
Less: write-offs, net of recoveries |  | 4 | 7 | 13 | 22
Ending balance | $ 270 | 338 | 141 | 338 | 141
Number of arrearages days | D | 60 |  |  |  |
Term of payment plans | 24 months |  |  |  |
Allowance for long-term uncollectible accounts |  | 93 |  | 93 |
SCE | Customers |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  | 254 | 75 | 175 | 35
Included in operation and maintenance expenses in earning activities |  | 9 | 11 | 27 | 39
Included in operation and maintenance expenses in cost-recovery activities |  | 52 |  | 112 |
Deferred to regulatory memorandum accounts |  | 7 | 43 | 13 | 64
Less: write-offs, net of recoveries |  | 1 | 5 | 6 | 14
Ending balance | $ 254 | 321 | 124 | 321 | 124
SCE | All others |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  | 16 | 15 | 13 | 14
Included in operation and maintenance expenses in earning activities |  | 4 | 4 | 11 | 11
Less: write-offs, net of recoveries |  | 3 | 2 | 7 | 8
Ending balance | $ 16 | $ 17 | $ 17 | $ 17 | $ 17

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