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Nuclear Decommissioning Trust Fund (Tables)
12 Months Ended
Dec. 31, 2014
Nuclear Decommissioning Trust Fund Disclosure [Abstract]  
Summary of aggregate fair values and unrealized gains and losses (including other-than-temporary impairments) for the securities held in the nuclear decommissioning trust fund
The following table summarizes the aggregate fair values and unrealized gains and losses (including other-than-temporary impairments) for the securities held in the trust funds, as well as information about the contractual maturities of those securities.
 
As of December 31, 2014
 
As of December 31, 2013
(In millions, except otherwise noted)
Fair
Value
 
Unrealized
Gains
 
Unrealized
Losses
 
Weighted-
average
maturities
(in years)
 
Fair
Value
 
Unrealized
Gains
 
Unrealized
Losses
 
Weighted-
average
maturities
(in years)
Cash and cash equivalents
$
14

 
$

 
$

 

 
$
26

 
$

 
$

 

U.S. government and federal agency obligations
47

 
2

 

 
11

 
45

 
1

 
1

 
9

Federal agency mortgage-backed securities
74

 
2

 

 
25

 
62

 
1

 
1

 
24

Commercial mortgage-backed securities
25

 

 
1

 
30

 
14

 

 

 
29

Corporate debt securities
78

 
2

 
1

 
11

 
70

 
1

 
1

 
9

Equity securities
344

 
211

 

 

 
332

 
204

 

 

Foreign government fixed income securities
3

 
1

 

 
16

 
2

 

 

 
9

Total
$
585

 
$
218

 
$
2

 
 

 
$
551

 
$
207

 
$
3

 
 

Summary of proceeds from sales of available-for-sale securities and the related realized gains and losses
The following table summarizes proceeds from sales of available-for-sale securities and the related realized gains and losses from these sales. The cost of securities sold is determined on the specific identification method.
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(In millions)
Realized gains
$
29

 
$
25

 
$
12

Realized losses
8

 
8

 
7

Proceeds from sale of securities
600

 
488

 
399