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Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets at fair value |  |  |  |
Nuclear decommissioning trusts | $ 4,352 | $ 4,242 |  |
Southern California Edison |  |  |  |
Assets at fair value |  |  |  |
Nuclear decommissioning trusts | $ 4,352 | $ 4,242 | $ 4,290 | $ 4,331
Liabilities at fair value |  |  |  |
Percentage of equity investments located in the United States (as a percent) | 68.00% | 70.00% |  |
Collateralized mortgage obligations and other asset backed securities | $ 83 | $ 79 |  |
Payables, net, related to investments | 98 | 127 |  |
Southern California Edison | Fair Value, Measurements, Recurring |  |  |  |
Assets at fair value |  |  |  |
Derivative contracts | 70 | 74 |  |
Other | 103 | 33 |  |
Nuclear decommissioning trusts | 4,450 | 4,369 |  |
Total assets | 4,623 | 4,476 |  |
Liabilities at fair value |  |  |  |
Derivative contracts | 1,226 | 1,157 |  |
Netting and Collateral | 0 | 0 |  |
Total liabilities | 1,226 | 1,157 |  |
Net assets (liabilities) | 3,397 | 3,319 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Stocks |  |  |  |
Assets at fair value |  |  |  |
Nuclear decommissioning trusts | 1,537 | 1,547 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Fixed income |  |  |  |
Assets at fair value |  |  |  |
Nuclear decommissioning trusts | 2,741 | 2,616 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents |  |  |  |
Assets at fair value |  |  |  |
Nuclear decommissioning trusts | 172 | 206 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Assets at fair value |  |  |  |
Derivative contracts | 0 | 0 |  |
Other | 103 | 33 |  |
Nuclear decommissioning trusts | 2,778 | 2,448 |  |
Total assets | 2,881 | 2,481 |  |
Liabilities at fair value |  |  |  |
Derivative contracts | 0 | 0 |  |
Total liabilities | 0 | 0 |  |
Net assets (liabilities) | 2,881 | 2,481 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Stocks |  |  |  |
Assets at fair value |  |  |  |
Nuclear decommissioning trusts | 1,537 | 1,547 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Fixed income |  |  |  |
Assets at fair value |  |  |  |
Nuclear decommissioning trusts | 1,153 | 865 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents |  |  |  |
Assets at fair value |  |  |  |
Nuclear decommissioning trusts | 88 | 36 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Assets at fair value |  |  |  |
Derivative contracts | 15 | 6 |  |
Other | 0 | 0 |  |
Nuclear decommissioning trusts | 1,672 | 1,921 |  |
Total assets | 1,687 | 1,927 |  |
Liabilities at fair value |  |  |  |
Derivative contracts | 5 | 0 |  |
Total liabilities | 5 | 0 |  |
Net assets (liabilities) | 1,682 | 1,927 |  |
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 | 1,588 | 1,751 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents |  |  |  |
Assets at fair value |  |  |  |
Nuclear decommissioning trusts | 84 | 170 |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Assets at fair value |  |  |  |
Derivative contracts | 55 | 68 |  |
Other | 0 | 0 |  |
Nuclear decommissioning trusts | 0 | 0 |  |
Total assets | 55 | 68 |  |
Liabilities at fair value |  |  |  |
Derivative contracts | 1,221 | 1,157 |  |
Total liabilities | 1,221 | 1,157 |  |
Net assets (liabilities) | (1,166) | (1,089) |  |
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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