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Changes in Capital Structure (Tables)
9 Months Ended
Sep. 30, 2011
Changes in Capital Structure Disclosure [Abstract] 
Changes in NRG's common shares issued and outstanding
The following table reflects the changes in NRG's common shares issued and outstanding:
 
Issued
Treasury
Outstanding
Balance as of December 31, 2010
304,006,027

(56,808,672
)
247,197,355

Shares issued under LTIP
168,295

—

168,295

Shares issued under ESPP
—

120,127

120,127

Capital Allocation Plan repurchases
—

(8,879,574
)
(8,879,574
)
Balance as of September 30, 2011
304,174,322

(65,568,119
)
238,606,203