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Investments (Tables) - Southern California Edison
 6 Months Ended
Jun. 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)
 
June 30,
2016
 
December 31,
2015
 
June 30,
2016
 
December 31, 2015
Stocks
—
 
$
329

 
$
304

 
$
1,488

 
$
1,460

Municipal bonds
2054
 
675

 
691

 
854

 
840

U.S. government and agency securities
2046
 
1,002

 
1,070

 
1,107

 
1,128

Corporate bonds
2057
 
683

 
708

 
771

 
755

Short-term investments and receivables/payables1
One-year
 
121

 
144

 
124

 
148

Total
 
 
$
2,810

 
$
2,917

 
$
4,344

 
$
4,331


1
Short-term investments include $85 million and $81 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and matured by July 5, 2016 and January 5, 2016 as of June 30, 2016 and December 31, 2015, respectively.
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)
 
2016
 
2015
 
2016
 
2015
Balance at beginning of period
 
$
4,290

 
$
4,896

 
$
4,331

 
$
4,799

Gross realized gains
 
22

 
5

 
75

 
32

Gross realized losses
 
(1
)
 
(3
)
 
(4
)
 
(5
)
Unrealized gains (losses), net
 
72

 
(71
)
 
113

 
(27
)
Other-than-temporary impairments
 
(8
)
 
(8
)
 
(33
)
 
(12
)
Interest and dividends
 
32

 
32

 
60

 
60

Contributions
 
—

 
—

 
—

 
7

Income taxes
 
(24
)
 
(14
)
 
(42
)
 
(14
)
Decommissioning disbursements
 
(38
)
 
—

 
(154
)
 
—

Administrative expenses and other
 
(1
)
 
(1
)
 
(2
)
 
(4
)
Balance at end of period
 
$
4,344

 
$
4,836

 
$
4,344

 
$
4,836