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Capital Structure (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Changes in NRG's common shares issued and outstanding

The following table reflects the changes in NRG's common shares issued and outstanding for each period presented:

	Common
	Issued			Treasury			Outstanding
Balance as of December 31, 2015	416,939,950			(102,749,908	)		314,190,042
Shares issued under ESPP	—			609,094			609,094
Shares issued under LTIPs	643,875			—			643,875
Balance as of December 31, 2016	417,583,825			(102,140,814	)		315,443,011
Shares issued under ESPP	—			560,769			560,769
Shares issued under LTIPs	739,309			—			739,309
Balance as of December 31, 2017	418,323,134			(101,580,045	)		316,743,089
Shares issued under ESPP	—			175,862			175,862
Shares issued under LTIPs	1,965,752			—			1,965,752
Share repurchases	—			(35,234,664	)		(35,234,664	)
Balance as of December 31, 2018	420,288,886			(136,638,847	)		283,650,039

NRG's common stock reserved for the maximum number of shares potentially issuable based on the conversion and redemption features of outstanding equity instruments and the long-term incentive plans

The following table summarizes NRG's common stock reserved for the maximum number of shares potentially issuable based on the conversion and redemption features of the long-term incentive plans as of December 31, 2018:

Equity Instrument	Common Stock Reserve Balance
Long-term incentive plans	17,631,031

Summary of shares repurchased

Share Repurchases — In 2018, the Company's board of directors authorized the Company to repurchase $1.5 billion of its common stock. In addition, the Company's board of directors authorized in February 2019 an additional $1.0 billion share repurchase program to be executed in 2019.

The following table summarizes the shares repurchased under the 2018 program, including shares repurchased under two completed accelerated repurchase agreements:

	Total number of shares purchased		Average price paid per share			Amounts paid for shares purchased (in millions)
Open market repurchases	11,097,631					$	396
Shares repurchased under May 24, 2018 Accelerated Repurchase Agreement	10,829,903					354
Shares repurchased under September 5, 2018 Accelerated Repurchase Agreement	13,307,130					500
Total Share Repurchases as of December 31, 2018	35,234,664					1,250
Additional open market repurchases through February 28, 2019	6,153,415					250
Total Share Repurchases as of February 28, 2019	41,388,079		$	36.24		$	1,500

Changes in redeemable preferred stock

The following table reflects the changes in the Company's redeemable preferred stock balance for the years ended December 31, 2018, 2017, and 2016:

	(In millions)
Balance as of December 31, 2015	$	302
Accretion to redemption value	2
Repurchase of 2.822% redeemable preferred stock	(226		)
Gain on redemption of 2.822% redeemable preferred stock	(78		)
Balance as of December 31, 2016	$	—
Balance as of December 31, 2017	$	—
Balance as of December 31, 2018	$	—

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