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Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | $ 2,817 | $ 2,917
Fair Value | 4,290 | 4,331
Stocks |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 311 | 304
Fair Value | 1,464 | 1,460
Municipal bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 736 | 691
Fair Value | 894 | 840
U.S. government and agency securities |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 1,002 | 1,070
Fair Value | 1,092 | 1,128
Corporate bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 662 | 708
Fair Value | 731 | 755
Short-term investments and receivables/payables |  |
Fair Value Disclosures: |  |
Repurchase agreement | 8 | 81
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 106 | 144
Fair Value | $ 109 | $ 148

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