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Other Investments | 6 Months Ended
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Jun. 30, 2014
Regulated Entity, Other Assets, Noncurrent [Abstract] |
Other Investments | Other Investments Nuclear Decommissioning Trusts Future decommissioning costs related to SCE's nuclear assets are expected to be funded from independent decommissioning trusts, which received $6 million in 2014 through SCE customer rates. Contributions to the decommissioning trusts are reviewed every three years by the CPUC. The following table sets forth amortized cost and fair value of the trust investments:
| Longest Maturity Dates |  | Amortized Cost |  | Fair Value
(in millions) |  | June 30, 2014 |  | December 31, 2013 |  | June 30, 2014 |  | December 31, 2013
Stocks | — |  | $ | 683 |  |  | $ | 656 |  |  | $ | 2,332 |  |  | $ | 2,208 |
Municipal bonds | 2051 |  | 688 |  |  | 675 |  |  | 812 |  |  | 756 |
U.S. government and agency securities | 2044 |  | 824 |  |  | 902 |  |  | 881 |  |  | 947 |
Corporate bonds | 2054 |  | 339 |  |  | 208 |  |  | 390 |  |  | 241 |
Short-term investments and receivables/payables | One-year |  | 312 |  |  | 329 |  |  | 325 |  |  | 342 |
Total |  |  | $ | 2,846 |  |  | $ | 2,770 |  |  | $ | 4,740 |  |  | $ | 4,494 |
Trust fund earnings (based on specific identification) increase the trust fund balance and the ARO regulatory liability. Proceeds from sales of securities (which are reinvested) were $2.2 billion and $1.5 billion for the three months ended June 30, 2014 and 2013, and $3.8 billion and $2.0 billion for the six months ended June 30, 2014 and 2013, respectively. Unrealized holding gains, net of losses, were $1.9 billion and $1.7 billion at June 30, 2014 and December 31, 2013, respectively. The following table sets forth a summary of changes in the fair value of the trust:
|  | Three months ended June 30, |  | Six months ended June 30,
(in millions) |  | 2014 |  | 2013 |  | 2014 |  | 2013
Balance at beginning of period |  | $ | 4,587 |  |  | $ | 4,246 |  |  | $ | 4,494 |  |  | $ | 4,048 |
Gross realized gains |  | 28 |  |  | 137 |  |  | 38 |  |  | 142 |
Gross realized losses |  | — |  |  | (1 | ) |  | — |  |  | (2 | )
Unrealized gains (losses), net |  | 107 |  |  | (185 | ) |  | 169 |  |  | (9 | )
Other-than-temporary impairments |  | (3 | ) |  | (21 | ) |  | (6 | ) |  | (29 | )
Interest, dividends, contributions and other |  | 21 |  |  | 5 |  |  | 45 |  |  | 31 |
Balance at end of period |  | $ | 4,740 |  |  | $ | 4,181 |  |  | $ | 4,740 |  |  | $ | 4,181 |
Due to regulatory mechanisms, changes in assets of the trusts from income items have no impact on operating revenue or earnings.

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