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Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | --- | ---
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | $ 4,388 |  | $ 4,799 |  |  |
Liabilities at fair value |  |  |  |  |  |
Money market funds | 35 |  | 35 |  |  |
Southern California Edison |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | $ 4,388 | $ 4,836 | $ 4,799 | $ 4,741 | $ 4,740 | $ 4,494
Liabilities at fair value |  |  |  |  |  |
Percentage of equity investments located in the United States (as a percent) | 68.00% |  | 73.00% |  |  |
Collateralized mortgage obligations and other asset backed securities | $ 149 |  | $ 49 |  |  |
Payables, net, related to investments | 31 |  | 57 |  |  |
Money market funds | 5 |  | 5 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring |  |  |  |  |  |
Liabilities at fair value |  |  |  |  |  |
Liability offset | (35) |  | (61) |  |  |
Asset offset | 35 |  | 61 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 0 |  | 0 |  |  |
Other | 25 |  | 33 |  |  |
Nuclear decommissioning trusts | 2,562 |  | 3,340 |  |  |
Total assets | 2,587 |  | 3,373 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 0 |  | 0 |  |  |
Total liabilities | 0 |  | 0 |  |  |
Net assets (liabilities) | 2,587 |  | 3,373 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Stocks |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 1,559 |  | 2,031 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Fixed income |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 977 |  | 703 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 26 |  | 606 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 0 |  | 0 |  |  |
Other | 0 |  | 0 |  |  |
Nuclear decommissioning trusts | 1,857 |  | 1,516 |  |  |
Total assets | 1,857 |  | 1,516 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 46 |  | 86 |  |  |
Total liabilities | 46 |  | 86 |  |  |
Net assets (liabilities) | 1,811 |  | 1,430 |  |  |
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 | 1,745 |  | 1,350 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 112 |  | 166 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 269 |  | 321 |  |  |
Other | 0 |  | 0 |  |  |
Nuclear decommissioning trusts | 0 |  | 0 |  |  |
Total assets | 269 |  | 321 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 1,362 |  | 1,223 |  |  |
Total liabilities | 1,362 |  | 1,223 |  |  |
Net assets (liabilities) | (1,093) |  | (902) |  |  |
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 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Total |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Derivative contracts | 269 |  | 321 |  |  |
Other | 25 |  | 33 |  |  |
Nuclear decommissioning trusts | 4,419 |  | 4,856 |  |  |
Total assets | 4,713 |  | 5,210 |  |  |
Liabilities at fair value |  |  |  |  |  |
Derivative contracts | 1,373 |  | 1,248 |  |  |
Total liabilities | 1,373 |  | 1,248 |  |  |
Net assets (liabilities) | 3,340 |  | 3,962 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Total | Stocks |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 1,559 |  | 2,031 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Total | Fixed income |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | 2,722 |  | 2,053 |  |  |
Southern California Edison | Fair Value, Measurements, Recurring | Total | Short-term investments, primarily cash equivalents |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |
Nuclear decommissioning trusts | $ 138 |  | $ 772 |  |  |

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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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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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