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Other Investments | 12 Months Ended
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Dec. 31, 2014
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 received $5 million in 2014 and $22 million in 2013 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) |  | 2014 |  | 2013 |  | 2014 |  | 2013
Stocks | — |  | $ | 524 |  |  | $ | 656 |  |  | $ | 2,031 |  |  | $ | 2,208 |
Municipal bonds | 2054 |  | 681 |  |  | 675 |  |  | 822 |  |  | 756 |
U.S. government and agency securities | 2045 |  | 777 |  |  | 902 |  |  | 836 |  |  | 947 |
Corporate bonds | 2057 |  | 346 |  |  | 208 |  |  | 395 |  |  | 241 |
Short-term investments and receivables/payables | One-year |  | 692 |  |  | 329 |  |  | 715 |  |  | 342 |
Total |  |  | $ | 3,020 |  |  | $ | 2,770 |  |  | $ | 4,799 |  |  | $ | 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 $10.1 billion, $5.6 billion, and $2.1 billion for the years ended December 31, 2014, 2013 and 2012, respectively. Unrealized holding gains, net of losses, were $1.8 billion and $1.7 billion at December 31, 2014 and 2013, respectively. The following table sets forth a summary of changes in the fair value of the trusts:
| Years ended December 31,
(in millions) | 2014 |  | 2013 |  | 2012
Balance at beginning of period | $ | 4,494 |  |  | $ | 4,048 |  |  | $ | 3,592 |
Gross realized gains | 197 |  |  | 300 |  |  | 73 |
Gross realized losses | (5 | ) |  | (32 | ) |  | (5 | )
Unrealized gains, net | 75 |  |  | 160 |  |  | 276 |
Other-than-temporary impairments | (14 | ) |  | (47 | ) |  | (36 | )
Interest, dividends and other | 118 |  |  | 113 |  |  | 113 |
Contributions | 5 |  |  | 22 |  |  | 23 |
Income taxes | (62 | ) |  | (66 | ) |  | 17 |
Decommissioning costs | (4 | ) |  | — |  |  | — |
Administrative expenses and other | (5 | ) |  | (4 | ) |  | (5 | )
Balance at end of period | $ | 4,799 |  |  | $ | 4,494 |  |  | $ | 4,048 |
Trust assets are used to pay income taxes as the Trust files separate income taxes returns from SCE. Deferred income taxes related to unrealized gains at December 31, 2014 were $441 million. Accordingly, the fair value of Trust assets available to pay future decommissioning costs, net of deferred income taxes, totaled $4.4 billion at December 31, 2014. 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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