Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2012
Derivative Instruments [Abstract]  
Gain/(Loss) Recognized In Income For Derivative Instruments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In Millions 

 

Three Months Ended

 

Nine Months Ended

September 30
2012 
2011 

 
2012 
2011 

CMS Energy

 

 

 

 

 

 

 

 

 

 

 

 

 

Commodity contracts

 

 

 

 

 

 

 

 

 

 

 

 

 

Operating revenue

 

$
(2)

 

$
(1)

 

 

$
1 

 

$
(1)

Fuel for electric generation

 

 

 -

 

 

 -

 

 

 
(2)

 

 

 -

Cost of gas sold

 

 
1 

 

 

 -

 

 

 
1 

 

 

 -

Purchased and interchange power

 

 

 -

 

 

 -

 

 

 
(1)

 

 

 -

Total CMS Energy

 

$
(1)

 

$
(1)

 

 

$
(1)

 

$
(1)