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Other Investments
 6 Months Ended
Jun. 30, 2013
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 currently receive contributions of approximately $23 million per year through SCE customer rates.
The following table sets forth amortized cost and fair value of the trust investments:
 
Longest
Maturity
Dates
 
Amortized Cost
 
Fair Value
(in millions)
 
June 30,
2013
 
December 31,
2012
 
June 30,
2013
 
December 31, 2012
Stocks
—
 
$
728

 
$
978

 
$
2,085

 
$
2,271

Municipal bonds
2051
 
504

 
518

 
592

 
644

U.S. government and agency securities
2043
 
975

 
547

 
1,025

 
603

Corporate bonds
2054
 
293

 
324

 
347

 
410

Short-term investments, primarily cash equivalents
One-year
 
274

 
117

 
280

 
121

Total investments
 
 
2,774

 
2,484

 
4,329

 
4,049

Net payables
 
 
(148
)
 
(1
)
 
(148
)
 
(1
)
Total nuclear decommissioning trusts
 
 
$
2,626

 
$
2,483

 
$
4,181

 
$
4,048


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 $1.5 billion and $496 million for the three months ended June 30, 2013 and 2012, respectively and $2.0 billion and $1.1 billion for the six months ended June 30, 2013 and 2012, respectively. Unrealized holding gains, net of losses, were $1.3 billion and $1.6 billion at June 30, 2013 and December 31, 2012, 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)
2013
 
2012
 
2013
 
2012
Balance at beginning of period
$
4,246

 
$
3,853

 
$
4,048

 
$
3,592

Gross realized gains
137

 
15

 
142

 
40

Gross realized losses
(1
)
 
(1
)
 
(2
)
 
(5
)
Unrealized gains (losses), net
(185
)
 
(67
)
 
(9
)
 
116

Other-than-temporary impairments
(21
)
 
(19
)
 
(29
)
 
(23
)
Interest, dividends, contributions and other
5

 
29

 
31

 
90

Balance at end of period
$
4,181

 
$
3,810

 
$
4,181

 
$
3,810


Due to regulatory mechanisms, earnings and realized gains and losses (including other-than-temporary impairments) have no impact on operating revenue or earnings.