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Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,562 | $ 4,120
SCE |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,562 | $ 4,120
Liabilities at fair value |  |
Percentage of equity investments located in the United States (as a percent) | 72.00% | 71.00%
Collateralized mortgage obligations and other asset backed securities | $ 46 | $ 67
Payables, net, related to investments | (111) | (143)
SCE | Fair Value, Measurements, Recurring |  |
Assets at fair value |  |
Netting and Collateral | (15) | 0
Derivative contracts, net | 87 | 173
Other | 18 | 30
Nuclear decommissioning trusts | 4,673 | 4,263
Total assets | 4,778 | 4,466
Liabilities at fair value |  |
Netting and Collateral | (15) | (7)
Derivative contracts, net | 1 | 6
Total liabilities | 1 | 6
Net assets | 4,777 | 4,460
Cash collateral posted | 0 | 7
SCE | Fair Value, Measurements, Recurring | Level 1 |  |
Assets at fair value |  |
Derivative contracts | 0 | 0
Other | 4 | 9
Nuclear decommissioning trusts | 2,601 | 2,503
Total assets | 2,605 | 2,512
Liabilities at fair value |  |
Derivative contracts | 0 | 0
Total liabilities | 0 | 0
Net assets | 2,605 | 2,512
SCE | Fair Value, Measurements, Recurring | Level 2 |  |
Assets at fair value |  |
Derivative contracts | 19 | 32
Other | 14 | 21
Nuclear decommissioning trusts | 2,072 | 1,760
Total assets | 2,105 | 1,813
Liabilities at fair value |  |
Derivative contracts | 11 | 13
Total liabilities | 11 | 13
Net assets | 2,094 | 1,800
SCE | Fair Value, Measurements, Recurring | Level 3 |  |
Assets at fair value |  |
Derivative contracts | 83 | 141
Other | 0 | 0
Nuclear decommissioning trusts | 0 | 0
Total assets | 83 | 141
Liabilities at fair value |  |
Derivative contracts | 5 | 0
Total liabilities | 5 | 0
Net assets | 78 | 141
SCE | Fair Value, Measurements, Recurring | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,765 | 1,382
SCE | Fair Value, Measurements, Recurring | Stocks | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,765 | 1,382
SCE | Fair Value, Measurements, Recurring | Stocks | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
SCE | Fair Value, Measurements, Recurring | Stocks | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
SCE | Fair Value, Measurements, Recurring | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 2,762 | 2,666
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 738 | 1,001
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 2,024 | 1,665
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 146 | 215
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 98 | 120
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 48 | 95
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 0 | $ 0

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