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Other Investments | 12 Months Ended
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Dec. 31, 2012
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. If additional funds are needed for decommissioning, it is probable that the additional funds will be recoverable through customer rates. Funds collected, together with accumulated earnings, will be utilized solely for decommissioning. The CPUC has set certain restrictions related to the investments of these trusts. The following table sets forth amortized cost and fair value of the trust investments:
| Longest Maturity |  | Amortized Cost |  | Fair Value
|  | December 31,
(in millions) | Dates |  | 2012 |  | 2011 |  | 2012 |  | 2011
Stocks | — |  | $ | 978 |  |  | $ | 865 |  |  | $ | 2,271 |  |  | $ | 1,899 |
Municipal bonds | 2054 |  | 518 |  |  | 625 |  |  | 644 |  |  | 756 |
U.S. government and agency securities | 2043 |  | 547 |  |  | 516 |  |  | 603 |  |  | 580 |
Corporate bonds | 2054 |  | 324 |  |  | 259 |  |  | 410 |  |  | 317 |
Short-term investments and receivables/payables | One-year |  | 116 |  |  | 38 |  |  | 120 |  |  | 40 |
Total |  |  | $ | 2,483 |  |  | $ | 2,303 |  |  | $ | 4,048 |  |  | $ | 3,592 |
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 $2.1 billion, $2.8 billion and $1.4 billion for the years ended December 31, 2012, 2011 and 2010, respectively. Unrealized holding gains, net of losses, were $1.6 billion and $1.3 billion at December 31, 2012 and 2011, respectively. The following table sets forth a summary of changes in the fair value of the trust:
| Years ended December 31,
(in millions) | 2012 |  | 2011 |  | 2010
Balance at beginning of period | $ | 3,592 |  |  | $ | 3,480 |  |  | $ | 3,140 |
Gross realized gains | 73 |  |  | 108 |  |  | 125 |
Gross realized losses | (5 | ) |  | (17 | ) |  | (4 | )
Unrealized gains (losses), net | 276 |  |  | (7 | ) |  | 148 |
Other-than-temporary impairments | (36 | ) |  | (47 | ) |  | (27 | )
Interest, dividends, contributions and other | 148 |  |  | 75 |  |  | 98 |
Balance at end of period | $ | 4,048 |  |  | $ | 3,592 |  |  | $ | 3,480 |
Due to regulatory mechanisms, earnings and realized gains and losses (including other-than-temporary impairments) have no impact on operating revenue or earnings. Leases In 2012, an Edison International subsidiary sold their lease interest in the Beaver Valley Nuclear plant and lease investment in aircraft leases with American Airlines for an aggregate of $108 million and recorded a pre-tax gain of $65 million ($31 million after-tax). In 2011, Edison International subsidiaries recorded a $26 million pre-tax earnings charge ($16 million after-tax) related to a write down of lease interest in aircraft leases with American Airlines.

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