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Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,421 | $ 4,120
Southern California Edison |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,421 | $ 4,120
Liabilities at fair value |  |
Percentage of equity investments located in the United States | 71.00% | 71.00%
Collateralized mortgage obligations and other asset backed securities | $ 67 | $ 67
Payables, net, related to investments | 71 | 143
Southern California Edison | Fair Value, Measurements, Recurring |  |
Assets at fair value |  |
Netting and Collateral | (3) | 0
Derivative contracts, net | 63 | 173
Other | 30 | 30
Nuclear decommissioning trusts | 4,492 | 4,263
Total assets | 4,585 | 4,466
Liabilities at fair value |  |
Netting and Collateral | (30) | (7)
Derivative contracts | 4 | 6
Total liabilities | 4 | 6
Total assets, netting and collateral | 27 | 7
Net assets | 4,581 | 4,460
Southern California Edison | Fair Value, Measurements, Recurring | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,611 | 1,382
Southern California Edison | Fair Value, Measurements, Recurring | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 2,781 | 2,666
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 100 | 215
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 |  |
Assets at fair value |  |
Derivative contracts | 0 | 0
Other | 9 | 9
Nuclear decommissioning trusts | 2,650 | 2,503
Total assets | 2,659 | 2,512
Liabilities at fair value |  |
Derivative contracts | 0 | 0
Total liabilities | 0 | 0
Net assets | 2,659 | 2,512
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,611 | 1,382
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 960 | 1,001
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 79 | 120
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 |  |
Assets at fair value |  |
Derivative contracts | 3 | 32
Other | 21 | 21
Nuclear decommissioning trusts | 1,842 | 1,760
Total assets | 1,866 | 1,813
Liabilities at fair value |  |
Derivative contracts | 34 | 13
Total liabilities | 34 | 13
Net assets | 1,832 | 1,800
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,821 | 1,665
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 21 | 95
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 |  |
Assets at fair value |  |
Derivative contracts | 63 | 141
Other | 0 | 0
Nuclear decommissioning trusts | 0 | 0
Total assets | 63 | 141
Liabilities at fair value |  |
Derivative contracts | 0 | 0
Total liabilities | 0 | 0
Net assets | 63 | 141
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 | 0
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 0 | $ 0

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