Income Per Share (Tables)

12 Months Ended

Dec. 31, 2022

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)	2022		2021		2020
Basic income per share attributable to NRG Energy, Inc;
Net income attributable to NRG Energy, Inc. common stockholders	$	1,221	$	2,187	$	510
Weighted average number of common shares outstanding-basic	236		245		245
Income per weighted average common share — basic	$	5.17	$	8.93	$	2.08
Diluted income per share attributable to NRG Energy, Inc;
Net income attributable to NRG Energy, Inc. common stockholders	$	1,221	$	2,187	$	510
Weighted average number of common shares outstanding-basic	236		245		245
Incremental shares attributable to the issuance of equity compensation (treasury stock method)	—		—		1
Weighted average number of common shares outstanding-diluted	236		245		246
Income per weighted average common share — diluted	$	5.17	$	8.93	$	2.07