Income Per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Reconciliation of NRG's basic and diluted income per share

The reconciliation of NRG's basic income per share to diluted income per share is shown in the following table:

	Year Ended December 31,
(In millions, except per share amounts)	2021		2020		2019
Basic income per share attributable to NRG Energy, Inc;
Net income attributable to NRG Energy, Inc. common stockholders	$	2,187	$	510	$	4,438
Weighted average number of common shares outstanding-basic	245		245		262
Income per weighted average common share — basic	$	8.93	$	2.08	$	16.94
Diluted income per share attributable to NRG Energy, Inc;
Net income attributable to NRG Energy, Inc. common stockholders	$	2,187	$	510	$	4,438
Weighted average number of common shares outstanding-basic	245		245		262
Incremental shares attributable to the issuance of equity compensation (treasury stock method)	—		1		2
Weighted average number of common shares outstanding-diluted	245		246		264
Income per weighted average common share — diluted	$	8.93	$	2.07	$	16.81