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Capital Structure (Tables)

12 Months Ended

Dec. 31, 2017

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, 2014	415,506,176			(78,843,552	)		336,662,624
Shares issued under ESPP	—			283,139			283,139
Shares issued under LTIPs	1,433,774			—			1,433,774
Share repurchases	—			(24,189,495	)		(24,189,495	)
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

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, 2017:

Equity Instrument	Common Stock Reserve Balance
Long-term incentive plans	19,597,433

Dividends paid per common share

The following table lists the dividends paid per common share during 2017, 2016 and 2015:

	Fourth Quarter				Third Quarter				Second Quarter				First Quarter
2017	$	0.030			$	0.030			$	0.030			$	0.030
2016	$	0.030			$	0.030			$	0.030			$	0.145
2015	$	0.145			$	0.145			$	0.145			$	0.145

Class of Treasury Stock

Share Repurchases — During 2015 and 2014, the Company's board of directors authorized share repurchases of $481 million of its common stock, which were made as follows:

	Total number of shares purchased			Average price paid per share (a)				Amounts paid for shares purchased (in millions) (a)
Board Authorized Share Repurchases
Fourth Quarter 2014	1,624,360			$	26.95			$	44
First Quarter 2015	3,146,484			25.15				79
Second Quarter 2015	4,379,907			24.53				107
Third Quarter 2015	11,104,184			15.06				167
Fourth Quarter 2015	5,558,920			15.03				84
Total Board Authorized Share Repurchases	25,813,855							$	481

(a) The average price paid per share and amounts paid for shares purchased exclude the commissions of $0.015 per share paid in connection with the share repurchase.

Temporary Equity

The following table reflects the changes in the Company's redeemable preferred stock balance for the years ended December 31, 2017, 2016, and 2015:

	(In millions)
Balance as of December 31, 2014	$	291
Accretion to redemption value	11
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	$	—

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