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Financial and Other Derivative Instruments (Tables)
9 Months Ended
Sep. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair value of derivative instruments
The following represents the fair value of derivative instruments as of September 30, 2012 and December 31, 2011 (in millions):
 
September 30, 2012
 
December 31, 2011
FTRs — Other current assets
$
2

 
$
1

Total derivatives not designated as hedging instruments
$
2

 
$
1

Volume of Commodity Contracts [Table Text Block]
The following represents the cumulative gross volume of derivative contracts outstanding as of September 30, 2012:
Commodity
 
Number of Units
FTRs (MWh)
 
77,888