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Other Investments | 12 Months Ended
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Dec. 31, 2011
Other Investments Disclosure [Abstract] |
Other Investments | Other Investments Nuclear Decommissioning Trusts Future decommissioning costs of removal of nuclear assets are expected to be funded from independent decommissioning trusts, which currently receive contributions of approximately $23 million per year included in 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:
|  |  | Amortized Cost |  | Fair Value
(in millions) | Longest Maturity Dates |  | December 31, 2011 |  | December 31, 2010 |  | December 31, 2011 |  | December 31, 2010
Stocks | — |  | $ | 865 |  |  | $ | 895 |  |  | $ | 1,899 |  |  | $ | 2,029 |
Municipal bonds | 2051 |  | 625 |  |  | 706 |  |  | 756 |  |  | 790 |
U.S. government and agency securities | 2041 |  | 516 |  |  | 270 |  |  | 580 |  |  | 288 |
Corporate bonds | 2054 |  | 259 |  |  | 288 |  |  | 317 |  |  | 346 |
Short-term investments and receivables/payables | One-year |  | 38 |  |  | 26 |  |  | 40 |  |  | 27 |
Total |  |  | $ | 2,303 |  |  | $ | 2,185 |  |  | $ | 3,592 |  |  | $ | 3,480 |
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 $2.8 billion, $1.4 billion and $2.2 billion for the years ended December 31, 2011, 2010 and 2009, respectively. Unrealized holding gains, net of losses, were $1.3 billion at both December 31, 2011 and 2010. The following table sets forth a summary of changes in the fair value of the trust for the years ended December 31:
(in millions) |  | 2011 | 2010 | 2009
Balance at beginning of period |  | $ | 3,480 |  | $ | 3,140 |  | $ | 2,524 |
Gross realized gains |  | 108 |  | 125 |  | 242 |
Gross realized losses |  | (17 | ) | (4 | ) | (147 | )
Unrealized gains (losses) – net |  | (7 | ) | 148 |  | 526 |
Other-than-temporary impairments |  | (47 | ) | (27 | ) | (111 | )
Interest, dividends, contributions and other |  | 75 |  | 98 |  | 106 |
Balance at end of period |  | $ | 3,592 |  | $ | 3,480 |  | $ | 3,140 |
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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