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Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | $ 4,376 |  | $ 4,331 |  |  |
Southern California Edison |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | $ 4,376 | $ 4,344 | $ 4,331 | $ 4,388 | $ 4,836 | $ 4,799
Liabilities at fair value |  |  |  |  |  |
Percentage of equity investments located in the United States (as a percent) | 70.00% |  | 70.00% |  |  |
Collateralized mortgage obligations and other asset backed securities | $ 83 |  | $ 111 |  |  |
Payables, net, related to investments | 39 |  | 24 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 127 |  | 163 |  |  |
Other | 33 |  | 28 |  |  |
Nuclear decommissioning trusts | 4,415 |  | 4,355 |  |  |
Total assets | 4,575 |  | 4,546 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 1,292 |  | 1,318 |  |  |
Netting and Collateral | 1 |  | 15 |  |  |
Total liabilities | 1,292 |  | 1,318 |  |  |
Net assets (liabilities) | 3,283 |  | 3,228 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Stocks |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 1,538 |  | 1,460 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Fixed income |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 2,768 |  | 2,723 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 109 |  | 172 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 0 |  | 0 |  |  |
Other | 33 |  | 28 |  |  |
Nuclear decommissioning trusts | 2,421 |  | 2,498 |  |  |
Total assets | 2,454 |  | 2,526 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 0 |  | 0 |  |  |
Total liabilities | 0 |  | 0 |  |  |
Net assets (liabilities) | 2,454 |  | 2,526 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Stocks |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 1,538 |  | 1,460 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Fixed income |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 833 |  | 947 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 50 |  | 91 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 0 |  | 0 |  |  |
Other | 0 |  | 0 |  |  |
Nuclear decommissioning trusts | 1,994 |  | 1,857 |  |  |
Total assets | 1,994 |  | 1,857 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 3 |  | 22 |  |  |
Total liabilities | 3 |  | 22 |  |  |
Net assets (liabilities) | 1,991 |  | 1,835 |  |  |
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 | 1,935 |  | 1,776 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 59 |  | 81 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 127 |  | 163 |  |  |
Other | 0 |  | 0 |  |  |
Nuclear decommissioning trusts | 0 |  | 0 |  |  |
Total assets | 127 |  | 163 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 1,290 |  | 1,311 |  |  |
Total liabilities | 1,290 |  | 1,311 |  |  |
Net assets (liabilities) | (1,163) |  | (1,148) |  |  |
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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