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Investments (Tables) - Southern California Edison
 9 Months Ended
Sep. 30, 2016
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 (see Note 4 for a discussion of fair value of the trust investments):
 
Longest
Maturity
Dates
 
Amortized Cost
 
Fair Value
(in millions)
 
September 30,
2016
 
December 31,
2015
 
September 30,
2016
 
December 31, 2015
Stocks
—
 
$
321

 
$
304

 
$
1,538

 
$
1,460

Municipal bonds
2054
 
653

 
691

 
813

 
840

U.S. government and agency securities
2055
 
1,114

 
1,070

 
1,215

 
1,128

Corporate bonds
2057
 
656

 
708

 
740

 
755

Short-term investments and receivables/payables1
One-year
 
67

 
144

 
70

 
148

Total
 
 
$
2,811

 
$
2,917

 
$
4,376

 
$
4,331


1
Short-term investments include $81 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and matured by January 5, 2016 as of December 31, 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)
 
2016
 
2015
 
2016
 
2015
Balance at beginning of period
 
$
4,344

 
$
4,836

 
$
4,331

 
$
4,799

Gross realized gains
 
18

 
183

 
61

 
215

Gross realized losses
 
(1
)
 
(10
)
 
(5
)
 
(15
)
Unrealized gains (losses), net
 
32

 
(316
)
 
153

 
(343
)
Other-than-temporary impairments
 
(2
)
 
(10
)
 
(10
)
 
(22
)
Interest and dividends
 
28

 
28

 
88

 
88

Contributions
 
—

 
—

 
—

 
7

Income taxes
 
(5
)
 
—

 
(47
)
 
(14
)
Decommissioning disbursements
 
(38
)
 
(319
)
 
(192
)
 
(319
)
Administrative expenses and other
 
—

 
(4
)
 
(3
)
 
(8
)
Balance at end of period
 
$
4,376

 
$
4,388

 
$
4,376

 
$
4,388