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Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Credit Loss Roll Forward |  |  |  |  |
Allowance for uncollectible accounts | $ 47 |  | $ 47 |  | $ 43
SCE |  |  |  |  |
Credit Loss Roll Forward |  |  |  |  |
Beginning balance | 340 | $ 363 | 390 | $ 364 |
Current period provision for uncollectible accounts | 88 | 57 | 169 | 118 |
Write-offs, net of recoveries | (71) | (56) | (202) | (118) |
Ending balance | 357 | 364 | 357 | 364 |
Recovery from customers, incremental costs | 69 | 46 | 135 | 96 |
Allowance for uncollectible accounts | 47 |  | 47 |  | $ 43
SCE | Customers |  |  |  |  |
Credit Loss Roll Forward |  |  |  |  |
Beginning balance | 322 | 347 | 372 | 347 |
Current period provision for uncollectible accounts | 82 | 54 | 160 | 114 |
Write-offs, net of recoveries | (69) | (52) | (197) | (112) |
Ending balance | 335 | 349 | 335 | 349 |
SCE | All others |  |  |  |  |
Credit Loss Roll Forward |  |  |  |  |
Beginning balance | 18 | 16 | 18 | 17 |
Current period provision for uncollectible accounts | 6 | 3 | 9 | 4 |
Write-offs, net of recoveries | (2) | (4) | (5) | (6) |
Ending balance | $ 22 | $ 15 | $ 22 | $ 15 |

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