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Financial and Other Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair value of derivative instruments
The following represents the fair value of derivative instruments as of March 31, 2013 and December 31, 2012:
 
March 31
 
December 31
 
2013
 
2012
 
(In millions)
FTRs — Other current assets
$
1

 
$
1

Total derivatives not designated as hedging instrument
$
1

 
$
1

Volume of Commodity Contracts [Table Text Block]
The following represents the cumulative gross volume of derivative contracts outstanding as of March 31, 2013:
Commodity
Number of Units
FTRs (MWh)
19,077