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Other Investments | 12 Months Ended
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Dec. 31, 2013
Regulated Entity, Other Assets, Noncurrent [Abstract] |
Other Investments | Other Investments Nuclear Decommissioning Trusts Future decommissioning costs of removal of SCE's nuclear assets are expected to be funded from independent decommissioning trusts, which currently receive contributions of approximately $23 million per year 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 Date |  | Amortized Cost |  | Fair Value
|  | December 31,
(in millions) |  |  | 2013 |  | 2012 |  | 2013 |  | 2012
Stocks | — |  | $ | 656 |  |  | $ | 978 |  |  | $ | 2,208 |  |  | $ | 2,271 |
Municipal bonds | 2051 |  | 675 |  |  | 518 |  |  | 756 |  |  | 644 |
U.S. government and agency securities | 2044 |  | 902 |  |  | 547 |  |  | 947 |  |  | 603 |
Corporate bonds | 2054 |  | 208 |  |  | 324 |  |  | 241 |  |  | 410 |
Short-term investments and receivables/payables | One-year |  | 329 |  |  | 116 |  |  | 342 |  |  | 120 |
Total |  |  | $ | 2,770 |  |  | $ | 2,483 |  |  | $ | 4,494 |  |  | $ | 4,048 |
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 $5.6 billion, $2.1 billion and $2.8 billion for the years ended December 31, 2013, 2012 and 2011, respectively. Unrealized holding gains, net of losses, were $1.7 billion and $1.6 billion at December 31, 2013 and 2012, respectively. The following table sets forth a summary of changes in the fair value of the trusts:
| Years ended December 31,
(in millions) | 2013 |  | 2012 |  | 2011
Balance at beginning of period | $ | 4,048 |  |  | $ | 3,592 |  |  | $ | 3,480 |
Gross realized gains | 300 |  |  | 73 |  |  | 108 |
Gross realized losses | (32 | ) |  | (5 | ) |  | (17 | )
Unrealized gains (losses), net | 160 |  |  | 276 |  |  | (7 | )
Other-than-temporary impairments | (47 | ) |  | (36 | ) |  | (47 | )
Interest, dividends, contributions and other | 65 |  |  | 148 |  |  | 75 |
Balance at end of period | $ | 4,494 |  |  | $ | 4,048 |  |  | $ | 3,592 |
Due to regulatory mechanisms, earnings and realized gains and losses (including other-than-temporary impairments) have no impact on operating revenue or earnings.

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