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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in Accumulated other comprehensive loss by component for the years ended December 31, 2014 and 2013:
 
Changes in Accumulated Other Comprehensive Loss by Component (a)
 
Net Unrealized Gain/(Loss) on Investments
 
Benefit Obligations (b)
 
Total
 
(In millions)
Balance, January 1, 2013
$
—

 
$
(22
)
 
$
(22
)
Other comprehensive income before reclassifications
1

 
3

 
4

Amounts reclassified from accumulated other comprehensive income
—

 
2

 
2

Net current-period other comprehensive income
1

 
5

 
6

Balance, December 31, 2013
$
1

 
$
(17
)
 
$
(16
)
Other comprehensive loss before reclassifications
—

 
(12
)
 
(12
)
Amounts reclassified from accumulated other comprehensive income
—

 
2

 
2

Net current-period other comprehensive loss
—

 
(10
)

(10
)
Balance, December 31, 2014
$
1

 
$
(27
)
 
$
(26
)
________________________________________
(a)
All amounts are net of tax.
(b)
The amounts reclassified from accumulated other comprehensive income (loss) are included in the computation of the net periodic pension and other postretirement benefit costs (see Note 16 to the Consolidated Financial Statements "Retirement Benefits and Trusteed Assets").
Schedule of Finite-Lived Intangible Assets
The Company has certain intangible assets relating to emission allowances and renewable energy credits as shown below:
 
December 31,
 
2014
 
2013
 
(In millions)
Emission allowances
$
1

 
$
2

Renewable energy credits
45

 
51

 
46

 
53

Less current intangible assets
9

 
12

 
$
37

 
$
41