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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
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 (see Note 4 for a discussion of fair value of the trust investments):
 
Longest
Maturity Date
 
Amortized Cost
 
Fair Value
 
 
December 31,
(in millions)
 
2016
 
2015
 
2016
 
2015
Stocks
—
 
$
319

 
$
304

 
$
1,547

 
$
1,460

Municipal bonds
2054
 
659

 
691

 
766

 
840

U.S. government and agency securities
2055
 
1,131

 
1,070

 
1,191

 
1,128

Corporate bonds
2057
 
600

 
708

 
659

 
755

Short-term investments and receivables/payables1
One-year
 
75

 
144

 
79

 
148

Total
 
 
$
2,784

 
$
2,917

 
$
4,242

 
$
4,331


1
Short-term investments include $114 million and $81 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 4, 2017 and January 5, 2016 as of December 31, 2016 and 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:
 
Years ended December 31,
(in millions)
2016
 
2015
 
2014
Balance at beginning of period
$
4,331

 
$
4,799

 
$
4,494

Gross realized gains
92

 
326

 
197

Gross realized losses
(19
)
 
(26
)
 
(5
)
Unrealized gains (losses)
44

 
(364
)
 
75

Other-than-temporary impairments
(36
)
 
(29
)
 
(14
)
Interest, dividends and other
116

 
115

 
118

Contributions
—

 
54

 
5

Income taxes
(58
)
 
(64
)
 
(62
)
Decommissioning disbursements
(224
)
 
(471
)
 
(4
)
Administrative expenses and other
(4
)
 
(9
)
 
(5
)
Balance at end of period
$
4,242

 
$
4,331

 
$
4,799