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Other Investments
 12 Months Ended
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.