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Fair Value Measurements - Schedule of Fair Value by Level within the Fair Value Hierarchy (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,475 | $ 4,286
SCE |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,475 | $ 4,286
Liabilities at fair value |  |
Percentage of equity investments located in the United States (as a percent) | 72.00% | 75.00%
Collateralized mortgage obligations and other asset backed securities | $ 61 | $ 94
Receivable (payables), net, related to investments | (216) | (105)
SCE | Fair Value, Recurring |  |
Assets at fair value |  |
Derivative contracts, netting and collateral | (3) | (1)
Derivative contracts, total | 137 | 212
Money market funds and other | 34 | 22
Nuclear decommissioning trusts | 4,691 | 4,391
Total assets | 4,862 | 4,625
Liabilities at fair value |  |
Derivative contracts, netting and collateral | (86) | (47)
Derivative contracts, total | 0 | 0
Total liabilities | 0 | 0
Net assets | 4,862 | 4,625
Net assets , netting and collateral | 83 | 46
SCE | Fair Value, Recurring | Level 1 |  |
Assets at fair value |  |
Derivative contracts | 0 | 0
Money market funds and other | 12 | 0
Nuclear decommissioning trusts | 2,984 | 2,734
Total assets | 2,996 | 2,734
Liabilities at fair value |  |
Derivative contracts | 0 | 0
Total liabilities | 0 | 0
Net assets | 2,996 | 2,734
SCE | Fair Value, Recurring | Level 2 |  |
Assets at fair value |  |
Derivative contracts | 0 | 1
Money market funds and other | 22 | 22
Nuclear decommissioning trusts | 1,707 | 1,657
Total assets | 1,729 | 1,680
Liabilities at fair value |  |
Derivative contracts | 83 | 47
Total liabilities | 83 | 47
Net assets | 1,646 | 1,633
SCE | Fair Value, Recurring | Level 3 |  |
Assets at fair value |  |
Derivative contracts | 140 | 212
Money market funds and other | 0 | 0
Nuclear decommissioning trusts | 0 | 0
Total assets | 140 | 212
Liabilities at fair value |  |
Derivative contracts | 3 | 0
Total liabilities | 3 | 0
Net assets | 137 | 212
SCE | Fair Value, Recurring | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,834 | 1,631
SCE | Fair Value, Recurring | Stocks | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,834 | 1,631
SCE | Fair Value, Recurring | Stocks | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
SCE | Fair Value, Recurring | Stocks | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
SCE | Fair Value, Recurring | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 2,693 | 2,593
SCE | Fair Value, Recurring | Fixed Income | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,017 | 975
SCE | Fair Value, Recurring | Fixed Income | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,676 | 1,618
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 | 164 | 167
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 133 | 128
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 31 | 39
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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