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Summary of Significant Accounting Policies (Allowance) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Allowance for long-term uncollectible accounts | $ 34 |  | $ 34 |  | $ 116
SCE |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 353 | $ 226 | 309 | $ 188 |
Included in operation and maintenance expenses in earning activities | 22 | 15 | 42 | 25 |
Included in operation and maintenance expenses in cost-recovery activities | 17 | 28 | 55 | 60 |
Deferred to regulatory memorandum accounts |  | 4 | 3 | 6 |
Less: write-offs, net of recoveries | 11 | 3 | 28 | 9 |
Ending balance | 381 | 270 | 381 | 270 |
Allowance for long-term uncollectible accounts | 34 |  | 34 |  | $ 116
SCE | Customers |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 337 | 210 | 293 | 175 |
Included in operation and maintenance expenses in earning activities | 20 | 12 | 33 | 18 |
Included in operation and maintenance expenses in cost-recovery activities | 17 | 28 | 55 | 60 |
Deferred to regulatory memorandum accounts |  | 4 | 3 | 6 |
Less: write-offs, net of recoveries | 10 |  | 20 | 5 |
Ending balance | 364 | 254 | 364 | 254 |
SCE | All others |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 16 | 16 | 16 | 13 |
Included in operation and maintenance expenses in earning activities | 2 | 3 | 9 | 7 |
Less: write-offs, net of recoveries | 1 | 3 | 8 | 4 |
Ending balance | $ 17 | $ 16 | $ 17 | $ 16 |

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