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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2012
Income Taxes [Abstract]  
Summary of Unrecognized Tax Benefits [Table Text Block]
The following table summarizes CERC’s unrecognized tax benefits at December 31, 2011 and June 30, 2012.

 
December 31, 2011
 
June 30,
 2012
 
(in millions)
Unrecognized tax benefits (expense)
$
8

 
$
(11
)
Portion of unrecognized tax benefits that, if recognized, would reduce the effective income tax rate
6

 
6

Interest accrued on unrecognized tax benefits
(4
)
 
(7
)