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Regulatory Matters
 12 Months Ended
Dec. 31, 2012
Regulatory Matters [Abstract]  
Regulatory Matters
Regulatory Matters

The following is a list of regulatory assets/liabilities reflected on CERC's Consolidated Balance Sheets as of December 31, 2011 and 2012:
 
December 31,
 
2011
 
2012
 
(in millions)
Regulatory assets in other long-term assets (1)
$
97

 
$
105

Regulatory liabilities
(597
)
 
(619
)
Net
$
(500
)
 
$
(514
)
________________
(1)
Regulatory assets that are not earning a return were not material at December 31, 2011 and 2012.