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Income Taxes Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2012
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Income tax expense (benefit)
$
(52
)
 
$
18

 
$
(58
)
 
$
(65
)
(1 
) 
Imputed tax rate
14
%
 
(35
)%
 
15
%
 
15
%
 
_________
(1)
Includes a tax benefit of approximately $76 million related to the election to consolidate our CCFC and Calpine groups for federal income tax reporting purposes for the six months ended June 30, 2011.
Schedule of Income Tax Expense (Benefit) Intraperiod Tax Allocation
The following table details the effects of our intraperiod tax allocations for the three and six months ended June 30, 2012 and 2011 (in millions).
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Intraperiod tax allocation expense (benefit) included in continuing operations
$
2

 
$
18

 
$
4

 
$
(16
)
Intraperiod tax allocation expense (benefit) included in OCI
$
(2
)
 
$
(18
)
 
$
(4
)
 
$
16