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Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,650 | $ 4,562
Southern California Edison |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,650 | $ 4,562
Liabilities at fair value |  |
Percentage of equity investments located in the United States | 72.00% | 72.00%
Collateralized mortgage obligations and other asset backed securities | $ 31 | $ 46
Payables, net, related to investments | 176 | 111
Southern California Edison | Fair Value, Measurements, Recurring |  |
Assets at fair value |  |
Netting and Collateral | (8) | (15)
Derivative contracts, net | 48 | 87
Money market funds and other | 24 | 18
Nuclear decommissioning trusts | 4,826 | 4,673
Total assets | 4,898 | 4,778
Liabilities at fair value |  |
Netting and Collateral | (8) | (15)
Derivative contracts | 0 | 1
Total liabilities | 0 | 1
Total assets, netting and collateral | 0 | 0
Net assets | 4,898 | 4,777
Southern California Edison | Fair Value, Measurements, Recurring | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,753 | 1,765
Southern California Edison | Fair Value, Measurements, Recurring | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 2,651 | 2,762
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 422 | 146
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 |  |
Assets at fair value |  |
Derivative contracts | 0 | 0
Money market funds and other | 1 | 4
Nuclear decommissioning trusts | 2,648 | 2,601
Total assets | 2,649 | 2,605
Liabilities at fair value |  |
Derivative contracts | 0 | 0
Total liabilities | 0 | 0
Net assets | 2,649 | 2,605
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,753 | 1,765
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 518 | 738
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 377 | 98
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 |  |
Assets at fair value |  |
Derivative contracts | 26 | 19
Money market funds and other | 23 | 14
Nuclear decommissioning trusts | 2,178 | 2,072
Total assets | 2,227 | 2,105
Liabilities at fair value |  |
Derivative contracts | 6 | 11
Total liabilities | 6 | 11
Net assets | 2,221 | 2,094
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 | 2,133 | 2,024
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 45 | 48
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 |  |
Assets at fair value |  |
Derivative contracts | 30 | 83
Money market funds and other | 0 | 0
Nuclear decommissioning trusts | 0 | 0
Total assets | 30 | 83
Liabilities at fair value |  |
Derivative contracts | 2 | 5
Total liabilities | 2 | 5
Net assets | 28 | 78
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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