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Investments (Tables) - Southern California Edison
 9 Months Ended
Sep. 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)
 
September 30,
2015
 
December 31,
2014
 
September 30,
2015
 
December 31, 2014
Stocks
—
 
$
386

 
$
524

 
$
1,559

 
$
2,031

Municipal bonds
2054
 
726

 
681

 
860

 
822

U.S. government and agency securities
2045
 
1,069

 
777

 
1,141

 
836

Corporate bonds
2057
 
668

 
346

 
721

 
395

Short-term investments and receivables/payables1
One-year
 
104

 
692

 
107

 
715

Total
 
 
$
2,953

 
$
3,020

 
$
4,388

 
$
4,799


1
Short-term investments include $112 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by October 7, 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 September 30,
 
Nine months ended September 30,
(in millions)
 
2015
 
2014
 
2015
 
2014
Balance at beginning of period
 
$
4,836

 
$
4,740

 
$
4,799

 
$
4,494

Gross realized gains
 
183

 
149

 
215

 
187

Gross realized losses
 
(10
)
 
—

 
(15
)
 
—

Unrealized (losses) gains, net
 
(316
)
 
(131
)
 
(343
)
 
38

Other-than-temporary impairments
 
(10
)
 
(4
)
 
(22
)
 
(10
)
Interest and dividends
 
28

 
28

 
88

 
90

Contributions
 
—

 
—

 
7

 
6

Income taxes
 
—

 
(40
)
 
(14
)
 
(59
)
Decommissioning disbursements
 
(319
)
 
—

 
(319
)
 
(1
)
Administrative expenses and other
 
(4
)
 
(1
)
 
(8
)
 
(4
)
Balance at end of period
 
$
4,388

 
$
4,741

 
$
4,388

 
$
4,741