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Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | $ 4,381 |  | $ 4,242 |  |  |
Southern California Edison |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | $ 4,381 | $ 4,352 | $ 4,242 | $ 4,344 | $ 4,290 | $ 4,331
Liabilities at fair value |  |  |  |  |  |
Percentage of equity investments located in the United States | 68.00% |  | 70.00% |  |  |
Collateralized mortgage obligations and other asset backed securities | $ 74 |  | $ 79 |  |  |
Payables, net, related to investments | 68 |  | 127 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 59 |  | 74 |  |  |
Other | 29 |  | 33 |  |  |
Nuclear decommissioning trusts | 4,449 |  | 4,369 |  |  |
Total assets | 4,537 |  | 4,476 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 1,058 |  | 1,157 |  |  |
Netting and Collateral | 0 |  | 0 |  |  |
Total liabilities | 1,058 |  | 1,157 |  |  |
Net assets (liabilities) | 3,479 |  | 3,319 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Stocks |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 1,611 |  | 1,547 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Fixed income |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 2,608 |  | 2,616 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 230 |  | 206 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 0 |  | 0 |  |  |
Other | 29 |  | 33 |  |  |
Nuclear decommissioning trusts | 2,771 |  | 2,448 |  |  |
Total assets | 2,800 |  | 2,481 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 0 |  | 0 |  |  |
Total liabilities | 0 |  | 0 |  |  |
Net assets (liabilities) | 2,800 |  | 2,481 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Stocks |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 1,611 |  | 1,547 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Fixed income |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 1,049 |  | 865 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 111 |  | 36 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 23 |  | 6 |  |  |
Other | 0 |  | 0 |  |  |
Nuclear decommissioning trusts | 1,678 |  | 1,921 |  |  |
Total assets | 1,701 |  | 1,927 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 10 |  | 0 |  |  |
Total liabilities | 10 |  | 0 |  |  |
Net assets (liabilities) | 1,691 |  | 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 | 1,559 |  | 1,751 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 119 |  | 170 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 36 |  | 68 |  |  |
Other | 0 |  | 0 |  |  |
Nuclear decommissioning trusts | 0 |  | 0 |  |  |
Total assets | 36 |  | 68 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 1,048 |  | 1,157 |  |  |
Total liabilities | 1,048 |  | 1,157 |  |  |
Net assets (liabilities) | (1,012) |  | (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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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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