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Summary of Significant Accounting Policies (Allowance) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for long-term uncollectible accounts | $ 99 |  | $ 116
SCE |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 309 | $ 188 |
Included in operation and maintenance expenses in earning activities | 20 | 10 |
Included in operation and maintenance expenses in cost-recovery activities | 38 | 32 |
Deferred to regulatory memorandum accounts | 3 | 2 |
Less: write-offs, net of recoveries | 17 | 6 |
Ending balance | 353 | 226 |
Allowance for long-term uncollectible accounts | 99 |  | $ 116
SCE | Customers |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 293 | 175 |
Included in operation and maintenance expenses in earning activities | 13 | 6 |
Included in operation and maintenance expenses in cost-recovery activities | 38 | 32 |
Deferred to regulatory memorandum accounts | 3 | 2 |
Less: write-offs, net of recoveries | 10 | 5 |
Ending balance | 337 | 210 |
SCE | All others |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 16 | 13 |
Included in operation and maintenance expenses in earning activities | 7 | 4 |
Less: write-offs, net of recoveries | 7 | 1 |
Ending balance | $ 16 | $ 16 |

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