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Other Investments | 6 Months Ended
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Jun. 30, 2012
Regulated Entity, Other Assets, Noncurrent [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 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:
|  |  | Amortized Cost |  | Fair Value
(in millions) | Longest Maturity Dates |  | June 30, 2012 |  | December 31, 2011 |  | June 30, 2012 |  | December 31, 2011
Stocks | — |  | $ | 953 |  |  | $ | 865 |  |  | $ | 2,090 |  |  | $ | 1,899 |
Municipal bonds | 2051 |  | 583 |  |  | 625 |  |  | 714 |  |  | 756 |
U.S. government and agency securities | 2041 |  | 489 |  |  | 516 |  |  | 549 |  |  | 580 |
Corporate bonds | 2054 |  | 310 |  |  | 259 |  |  | 382 |  |  | 317 |
Short-term investments and receivables/payables | One-year |  | 71 |  |  | 38 |  |  | 75 |  |  | 40 |
Total |  |  | $ | 2,406 |  |  | $ | 2,303 |  |  | $ | 3,810 |  |  | $ | 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 $496 million and $524 million for the three months ended June 30, 2012 and 2011, respectively, and $1.1 billion for both the six months ended June 30, 2012 and 2011. Unrealized holding gains, net of losses, were $1.4 billion and $1.3 billion at June 30, 2012 and December 31, 2011, 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) | 2012 |  | 2011 |  | 2012 |  | 2011
Balance at beginning of period | $ | 3,853 |  |  | $ | 3,619 |  |  | $ | 3,592 |  |  | $ | 3,480 |
Gross realized gains | 15 |  |  | 12 |  |  | 40 |  |  | 35 |
Gross realized losses | (1 | ) |  | — |  |  | (5 | ) |  | — |
Unrealized gains (losses) – net | (67 | ) |  | 4 |  |  | 116 |  |  | 106 |
Other-than-temporary impairments | (19 | ) |  | (4 | ) |  | (23 | ) |  | (13 | )
Interest, dividends, contributions and other | 29 |  |  | 26 |  |  | 90 |  |  | 49 |
Balance at end of period | $ | 3,810 |  |  | $ | 3,657 |  |  | $ | 3,810 |  |  | $ | 3,657 |
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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- Definition This element represents the disclosure of other investments held by the entity for investment purposes not otherwise defined in the taxonomy. + References No definition available. + Details
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Namespace Prefix: | sce_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration