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Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | $ 2,953 | $ 3,020
Fair Value | $ 4,388 | 4,799
Stocks |  |
Nuclear Decommissioning Trusts Disclosures |  |
Maturity Dates Decommissioning Trust Investments | 0 |
Amortized Cost | $ 386 | 524
Fair Value | $ 1,559 | 2,031
Municipal bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Maturity Dates Decommissioning Trust Investments | 2054 |
Amortized Cost | $ 726 | 681
Fair Value | $ 860 | 822
U.S. government and agency securities |  |
Nuclear Decommissioning Trusts Disclosures |  |
Maturity Dates Decommissioning Trust Investments | 2045 |
Amortized Cost | $ 1,069 | 777
Fair Value | $ 1,141 | 836
Corporate bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Maturity Dates Decommissioning Trust Investments | 2057 |
Amortized Cost | $ 668 | 346
Fair Value | 721 | 395
Short-term investments and receivables/payables |  |
Fair Value Disclosures: |  |
Repurchase agreement | $ 112 |
Nuclear Decommissioning Trusts Disclosures |  |
Longest Maturity Dates | 1 year |
Amortized Cost | $ 104 | 692
Fair Value | $ 107 | $ 715

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