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Other Investments (Tables) (Southern California Edison) | 9 Months Ended
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Sep. 30, 2014
Southern California Edison |
Investment [Line Items] |
Amortized Cost and Fair Value of the Trust Investments | The following table sets forth amortized cost and fair value of the trust investments:
| Longest Maturity Dates |  | Amortized Cost |  | Fair Value
(in millions) |  | September 30, 2014 |  | December 31, 2013 |  | September 30, 2014 |  | December 31, 2013
Stocks | — |  | $ | 500 |  |  | $ | 656 |  |  | $ | 1,970 |  |  | $ | 2,208 |
Municipal bonds | 2051 |  | 663 |  |  | 675 |  |  | 807 |  |  | 756 |
U.S. government and agency securities | 2045 |  | 826 |  |  | 902 |  |  | 888 |  |  | 947 |
Corporate bonds | 2057 |  | 333 |  |  | 208 |  |  | 385 |  |  | 241 |
Short-term investments and receivables/payables | One-year |  | 657 |  |  | 329 |  |  | 691 |  |  | 342 |
Total |  |  | $ | 2,979 |  |  | $ | 2,770 |  |  | $ | 4,741 |  |  | $ | 4,494 |
Summary of Changes in the Fair Value of Trust | The following table sets forth a summary of changes in the fair value of the trust:
|  | Three months ended September 30, |  | Nine months ended September 30,
(in millions) |  | 2014 |  | 2013 |  | 2014 |  | 2013
Balance at beginning of period |  | $ | 4,740 |  |  | $ | 4,182 |  |  | $ | 4,494 |  |  | $ | 4,048 |
Gross realized gains |  | 149 |  |  | 119 |  |  | 187 |  |  | 261 |
Gross realized losses |  | — |  |  | (17 | ) |  | — |  |  | (18 | )
Unrealized gains (losses), net |  | (131 | ) |  | 55 |  |  | 38 |  |  | 46 |
Other-than-temporary impairments |  | (4 | ) |  | (15 | ) |  | (10 | ) |  | (44 | )
Interest, dividends, contributions and other |  | (13 | ) |  | 8 |  |  | 32 |  |  | 39 |
Balance at end of period |  | $ | 4,741 |  |  | $ | 4,332 |  |  | $ | 4,741 |  |  | $ | 4,332 |

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