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Other Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Regulated Entity, Other Assets, Noncurrent [Abstract]  
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 Date
 
Amortized Cost
 
Fair Value
 
 
December 31,
(in millions)
 
2015
 
2014
 
2015
 
2014
Stocks
—
 
$
304

 
$
524

 
$
1,460

 
$
2,031

Municipal bonds
2054
 
691

 
681

 
840

 
822

U.S. government and agency securities
2046
 
1,070

 
777

 
1,128

 
836

Corporate bonds
2057
 
708

 
346

 
755

 
395

Short-term investments and receivables/payables1
One-year
 
144

 
692

 
148

 
715

Total
 
 
$
2,917

 
$
3,020

 
$
4,331

 
$
4,799


1
Short-term investments include $81 million and $164 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 5, 2016 and January 7, 2015 as of December 31, 2015 and 2014, 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 trusts:
 
Years ended December 31,
(in millions)
2015
 
2014
 
2013
Balance at beginning of period
$
4,799

 
$
4,494

 
$
4,048

Gross realized gains
326

 
197

 
300

Gross realized losses
(26
)
 
(5
)
 
(32
)
Unrealized (losses) gains
(364
)
 
75

 
160

Other-than-temporary impairments
(29
)
 
(14
)
 
(47
)
Interest, dividends and other
115

 
118

 
113

Contributions
54

 
5

 
22

Income taxes
(64
)
 
(62
)
 
(66
)
Decommissioning disbursements
(471
)
 
(4
)
 
—

Administrative expenses and other
(9
)
 
(5
)
 
(4
)
Balance at end of period
$
4,331

 
$
4,799

 
$
4,494