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Investments (Tables) - Southern California Edison
 6 Months Ended
Jun. 30, 2015
Investment [Line Items]  
Amortized Cost and Fair Value of the Trust Investments
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,
2015
 
December 31,
2014
 
June 30,
2015
 
December 31, 2014
Stocks
—
 
$
560

 
$
524

 
$
2,084

 
$
2,031

Municipal bonds
2054
 
705

 
681

 
826

 
822

U.S. government and agency securities
2045
 
1,116

 
777

 
1,173

 
836

Corporate bonds
2057
 
591

 
346

 
637

 
395

Short-term investments and receivables/payables1
One-year
 
113

 
692

 
116

 
715

Total
 
 
$
3,085

 
$
3,020

 
$
4,836

 
$
4,799


1
Short-term investments include $140 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by July 8, 2015.
Summary of Changes in the Fair Value of Trust
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)
 
2015
 
2014
 
2015
 
2014
Balance at beginning of period
 
$
4,896

 
$
4,587

 
$
4,799

 
$
4,494

Gross realized gains
 
5

 
28

 
32

 
38

Gross realized losses
 
(3
)
 
—

 
(5
)
 
—

Unrealized (losses) gains, net
 
(71
)
 
107

 
(27
)
 
169

Other-than-temporary impairments
 
(8
)
 
(3
)
 
(12
)
 
(6
)
Interest and dividends
 
32

 
33

 
60

 
62

Contributions
 
—

 
—

 
7

 
5

Income taxes
 
(14
)
 
(11
)
 
(14
)
 
(19
)
Administrative expenses and other
 
(1
)
 
(1
)
 
(4
)
 
(3
)
Balance at end of period
 
$
4,836

 
$
4,740

 
$
4,836

 
$
4,740