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Comprehensive (Loss)/Income (Tables)
9 Months Ended
Sep. 30, 2011
Comprehensive Loss Income Disclosure [Abstract] 
Summary of components of the Company's comprehensive income, net of tax
The following table summarizes the components of the Company's comprehensive (loss)/income, net of tax:
 
Three months ended September 30,
 
Nine months ended September 30,
(In millions)
2011
 
2010
 
2011
 
2010
Net (loss)/income
$
(55
)
 
$
223

 
$
306

 
$
491

Changes in derivative instruments
(76
)
 
59

 
(225
)
 
162

Foreign currency translation adjustment
(27
)
 
36

 
(5
)
 
(6
)
Unrealized loss on available-for-sale securities
(1
)
 
—

 
(1
)
 
(1
)
Other comprehensive (loss)/income
(104
)
 
95

 
(231
)
 
155

Less: Comprehensive loss attributable to noncontrolling interest
$
—

 
$
—

 
$
—

 
$
(1
)
Comprehensive (loss)/income attributable to NRG Energy, Inc.
$
(159
)
 
$
318

 
$
75

 
$
647

Summary of changes in the Company's accumulated other comprehensive income, or OCI, net of tax
The following table summarizes the changes in the Company’s accumulated other comprehensive income, or OCI, net of tax:
(In millions)
 
Accumulated other comprehensive income as of December 31, 2010
$
432

Changes in derivative instruments
(225
)
Foreign currency translation adjustment
(5
)
Unrealized loss on available-for-sale securities
$
(1
)
Accumulated other comprehensive income as of September 30, 2011
$
201