XML 58 R17.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Other Investments | 9 Months Ended
--- | ---
Sep. 30, 2014
Regulated Entity, Other Assets, Noncurrent [Abstract] |
Other Investments | Other Investments Nuclear Decommissioning Trusts Future decommissioning costs related to SCE's nuclear assets are expected to be funded from independent decommissioning trusts, which received $6 million in 2014 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 Dates |  | Amortized Cost |  | Fair Value
(in millions) |  | September 30, 2014 |  | December 31, 2013 |  | September 30, 2014 |  | December 31, 2013
Stocks | — |  | $ | 500 |  |  | $ | 656 |  |  | $ | 1,970 |  |  | $ | 2,208 |
Municipal bonds | 2051 |  | 663 |  |  | 675 |  |  | 807 |  |  | 756 |
U.S. government and agency securities | 2045 |  | 826 |  |  | 902 |  |  | 888 |  |  | 947 |
Corporate bonds | 2057 |  | 333 |  |  | 208 |  |  | 385 |  |  | 241 |
Short-term investments and receivables/payables | One-year |  | 657 |  |  | 329 |  |  | 691 |  |  | 342 |
Total |  |  | $ | 2,979 |  |  | $ | 2,770 |  |  | $ | 4,741 |  |  | $ | 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 $2.1 billion and $2.6 billion for the three months ended September 30, 2014 and 2013, and $5.8 billion and $4.6 billion for the nine months ended September 30, 2014 and 2013, respectively. Unrealized holding gains, net of losses, were $1.8 billion and $1.7 billion at September 30, 2014 and December 31, 2013, respectively. The following table sets forth a summary of changes in the fair value of the trust:
|  | Three months ended September 30, |  | Nine months ended September 30,
(in millions) |  | 2014 |  | 2013 |  | 2014 |  | 2013
Balance at beginning of period |  | $ | 4,740 |  |  | $ | 4,182 |  |  | $ | 4,494 |  |  | $ | 4,048 |
Gross realized gains |  | 149 |  |  | 119 |  |  | 187 |  |  | 261 |
Gross realized losses |  | — |  |  | (17 | ) |  | — |  |  | (18 | )
Unrealized gains (losses), net |  | (131 | ) |  | 55 |  |  | 38 |  |  | 46 |
Other-than-temporary impairments |  | (4 | ) |  | (15 | ) |  | (10 | ) |  | (44 | )
Interest, dividends, contributions and other |  | (13 | ) |  | 8 |  |  | 32 |  |  | 39 |
Balance at end of period |  | $ | 4,741 |  |  | $ | 4,332 |  |  | $ | 4,741 |  |  | $ | 4,332 |
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 September 30, 2014 were $431 million. Accordingly, the fair value of Trust assets available to pay future decommissioning costs, net of deferred income taxes, totaled $4.3 billion at September 30, 2014. Due to regulatory mechanisms, changes in assets of the trusts from income items have no impact on operating revenue or earnings.

X
- 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
Name: | eix_OtherInvestmentsDisclosureTextBlock
Namespace Prefix: | eix_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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