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Summary of Significant Accounting Policies (Allowance) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Credit Loss Roll Forward |  |  |
Beginning balance | $ 354 | $ 309 | $ 188
Current period provision for uncollectible accounts | 115 | 122 | 135
Write-offs, net of recoveries | (105) | (77) | (14)
Ending balance | 364 | 354 | 309
Recovery from customers, incremental costs | 78 | 40 | 91
Allowance for long-term credit losses | 4 | 7 |
Customers |  |  |
Credit Loss Roll Forward |  |  |
Beginning balance | 334 | 293 | 175
Current period provision for uncollectible accounts | 109 | 111 | 124
Write-offs, net of recoveries | (96) | (70) | (6)
Ending balance | 347 | 334 | 293
All others |  |  |
Credit Loss Roll Forward |  |  |
Beginning balance | 20 | 16 | 13
Current period provision for uncollectible accounts | 6 | 11 | 11
Write-offs, net of recoveries | (9) | (7) | (8)
Ending balance | $ 17 | $ 20 | $ 16

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