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Regulatory Assets and Liabilities - Schedule of Net Regulatory Balancing and Memorandum Accounts (Details) - SCE - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Regulatory Assets and Liabilities |  |
Assets, net of liabilities | $ 1,751 | $ 423
Energy procurement related costs |  |
Regulatory Assets and Liabilities |  |
Assets, net of liabilities | 325 | (97)
Public purpose and energy efficiency |  |
Regulatory Assets and Liabilities |  |
Assets, net of liabilities | (2,189) | (1,708)
GRC related balancing accounts |  |
Regulatory Assets and Liabilities |  |
Assets, net of liabilities | 1,188 | 976
FERC related balancing accounts |  |
Regulatory Assets and Liabilities |  |
Assets, net of liabilities | 48 | 125
Wildfire risk mitigation and insurance |  |
Regulatory Assets and Liabilities |  |
Assets, net of liabilities | 151 | 741
TKM Settlement cost recovery |  |
Regulatory Assets and Liabilities |  |
Assets, net of liabilities | 1,619 | 0
Wildfire and drought restoration |  |
Regulatory Assets and Liabilities |  |
Assets, net of liabilities | 291 | 238
Tax accounting memorandum account |  |
Regulatory Assets and Liabilities |  |
Assets, net of liabilities | (72) | (40)
Other |  |
Regulatory Assets and Liabilities |  |
Assets, net of liabilities | $ 390 | $ 188
Grid Hardening Balancing Account |  |
Regulatory Assets and Liabilities |  |
Authorized recovery threshold | 110.00% |

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