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Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Nuclear Decommissioning Trusts Disclosures |  |
Fair Value | $ 4,294 | $ 4,440
Southern California Edison |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 2,552 | 2,803
Fair Value | 4,294 | 4,440
Southern California Edison | Fair Value, Measurements, Recurring |  |
Nuclear Decommissioning Trusts Disclosures |  |
Fair Value | 4,417 | 4,499
Southern California Edison | Fair Value, Measurements, Recurring | Stocks |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost |  | 236
Fair Value | 1,527 | 1,596
Southern California Edison | Fair Value, Measurements, Recurring | Municipal bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 650 | 643
Fair Value | 753 | 768
Southern California Edison | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 1,214 | 1,235
Fair Value | 1,281 | 1,319
Southern California Edison | Fair Value, Measurements, Recurring | Corporate bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 623 | 579
Fair Value | 666 | 643
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments and receivables/payables |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 65 | 110
Fair Value | 67 | 114
Repurchase agreements payable | $ 47 | $ 29

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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://fasb.org/us-gaap/role/ref/legacyRef -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 The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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