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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss, SCE (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
SCE: |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | $ 15,565 |
Pension and PBOP: |  |  |  |  |  |  |
Other comprehensive income, net of tax | $ 0 | $ 2 | $ 2 | $ 1 |  | 2 | $ 3
Ending Balance | 17,155 |  |  |  |  | 17,155 |
Accumulated Other Comprehensive Income |  |  |  |  |  |  |
Pension and PBOP: |  |  |  |  |  |  |
Other comprehensive income, net of tax |  | 2 | 2 | 1 |  |  |
Reclassified from accumulated other comprehensive loss |  |  |  |  |  |  |
Pension and PBOP: |  |  |  |  |  |  |
Reclassified from accumulated other comprehensive loss | 0 |  | 1 |  |  | 1 | 2
SCE |  |  |  |  |  |  |
SCE: |  |  |  |  |  |  |
Beginning balance | 22,395 | 22,875 | 21,262 | 21,097 | $ 21,404 | 21,751 | 21,404
Pension and PBOP: |  |  |  |  |  |  |
Other comprehensive income, net of tax | 0 | 1 | 1 |  | 1 | 1 | 2
Ending Balance | 22,861 | 22,395 | 21,474 | 21,262 | 21,097 | 22,861 | 21,474
SCE | Accumulated Other Comprehensive Income |  |  |  |  |  |  |
SCE: |  |  |  |  |  |  |
Beginning balance | (8) | (9) | (11) | (11) | (12) | (9) | (12)
Pension and PBOP: |  |  |  |  |  |  |
Other comprehensive income, net of tax |  | 1 | 1 |  | 1 |  |
Ending Balance | (8) | $ (8) | (10) | $ (11) | $ (11) | (8) | (10)
SCE | Reclassified from accumulated other comprehensive loss |  |  |  |  |  |  |
Pension and PBOP: |  |  |  |  |  |  |
Reclassified from accumulated other comprehensive loss | $ 0 |  | $ 1 |  |  | $ 1 | $ 2

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