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Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Nuclear Decommissioning Trusts Disclosures |  |
Fair Value | $ 4,650 | $ 4,562
Southern California Edison |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 2,470 | 2,447
Fair Value | 4,650 | 4,562
Southern California Edison | Municipal bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 1,048 | 822
Southern California Edison | U.S. government and agency securities |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 707 | 996
Southern California Edison | Corporate bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 479 | 597
Southern California Edison | Short-term investments and receivables/payables |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 236 | 32
Southern California Edison | Fair Value, Measurements, Recurring |  |
Nuclear Decommissioning Trusts Disclosures |  |
Fair Value | 4,826 | 4,673
Southern California Edison | Fair Value, Measurements, Recurring | Stocks |  |
Nuclear Decommissioning Trusts Disclosures |  |
Fair Value | 1,753 | 1,765
Southern California Edison | Fair Value, Measurements, Recurring | Municipal bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Fair Value | 1,240 | 970
Southern California Edison | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Nuclear Decommissioning Trusts Disclosures |  |
Fair Value | 846 | 1,115
Southern California Edison | Fair Value, Measurements, Recurring | Corporate bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Fair Value | 565 | 679
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments and receivables/payables |  |
Nuclear Decommissioning Trusts Disclosures |  |
Fair Value | 246 | 33
Repurchase agreements payable | $ 122 | $ 41

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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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