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Summary of Significant Accounting Policies - Changes in Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Credit Loss Roll Forward |  |  |
Allowance for long-term credit losses | $ 43 | $ 4 |
SCE |  |  |
Credit Loss Roll Forward |  |  |
Beginning balance | 364 | 354 | $ 309
Current period provision for uncollectible accounts | 290 | 115 | 122
Write-offs, net of recoveries | (264) | (105) | (77)
Ending balance | 390 | 364 | 354
Recovery from customers, incremental costs | 222 | 78 | 40
Allowance for long-term credit losses | 43 | 4 |
SCE | Customers |  |  |
Credit Loss Roll Forward |  |  |
Beginning balance | 347 | 334 | 293
Current period provision for uncollectible accounts | 278 | 109 | 111
Write-offs, net of recoveries | (253) | (96) | (70)
Ending balance | 372 | 347 | 334
SCE | All others |  |  |
Credit Loss Roll Forward |  |  |
Beginning balance | 17 | 20 | 16
Current period provision for uncollectible accounts | 12 | 6 | 11
Write-offs, net of recoveries | (11) | (9) | (7)
Ending balance | $ 18 | $ 17 | $ 20

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