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Fair Value Measurements - Schedule of Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,286 | $ 4,173
SCE |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,286 | $ 4,173
Liabilities at fair value |  |
Percentage of equity investments located in the United States (as a percent) | 75.00% | 75.00%
Collateralized mortgage obligations and other asset backed securities | $ 94 | $ 106
Receivable (payables), net, related to investments | (105) | (102)
SCE | Fair Value, Recurring |  |
Assets at fair value |  |
Netting and Collateral | (1) | (3)
Derivative contracts, Total | 212 | 91
Other | 22 | 100
Nuclear decommissioning trusts | 4,391 | 4,275
Total assets | 4,625 | 4,466
Liabilities at fair value |  |
Netting and Collateral | (47) | (77)
Derivative contracts, Total | 0 | 0
Total liabilities | 0 | 0
Net assets | 4,625 | 4,466
Netting and Collateral, Total | 46 | 74
SCE | Fair Value, Recurring | Level 1 |  |
Assets at fair value |  |
Derivative contracts | 0 | 0
Other | 0 | 78
Nuclear decommissioning trusts | 2,734 | 2,750
Total assets | 2,734 | 2,828
Liabilities at fair value |  |
Derivative contracts | 0 | 0
Total liabilities | 0 | 0
Net assets | 2,734 | 2,828
SCE | Fair Value, Recurring | Level 2 |  |
Assets at fair value |  |
Derivative contracts | 1 | 3
Other | 22 | 22
Nuclear decommissioning trusts | 1,657 | 1,525
Total assets | 1,680 | 1,550
Liabilities at fair value |  |
Derivative contracts | 47 | 77
Total liabilities | 47 | 77
Net assets | 1,633 | 1,473
SCE | Fair Value, Recurring | Level 3 |  |
Assets at fair value |  |
Derivative contracts | 212 | 91
Other | 0 | 0
Nuclear decommissioning trusts | 0 | 0
Total assets | 212 | 91
Liabilities at fair value |  |
Derivative contracts | 0 | 0
Total liabilities | 0 | 0
Net assets | 212 | 91
SCE | Fair Value, Recurring | Equity securities |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,631 | 1,658
SCE | Fair Value, Recurring | Equity securities | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,631 | 1,658
SCE | Fair Value, Recurring | Equity securities | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
SCE | Fair Value, Recurring | Equity securities | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
SCE | Fair Value, Recurring | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 2,593 | 2,344
SCE | Fair Value, Recurring | Fixed Income | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 975 | 923
SCE | Fair Value, Recurring | Fixed Income | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,618 | 1,421
SCE | Fair Value, Recurring | Fixed Income | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 167 | 273
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 128 | 169
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 39 | 104
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 0 | $ 0

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