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Capital Structure (Tables)
 12 Months Ended
Dec. 31, 2019
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
 IssuedTreasuryOutstanding
Balance as of December 31, 2016417,583,825  (102,140,814) 315,443,011  
Shares issued under ESPP—  560,769  560,769  
Shares issued under LTIPs739,309  —  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 LTIPs1,965,752  —  1,965,752  
Share repurchases—  (35,234,664) (35,234,664) 
Balance as of December 31, 2018420,288,886  (136,638,847) 283,650,039  
Shares issued under ESPP—  46,128  46,128  
Shares issued under LTIPs1,601,904  —  1,601,904  
Share repurchases—  (36,301,882) (36,301,882) 
Balance as of December 31, 2019421,890,790  (172,894,601) 248,996,189  
Summary of shares repurchased
The following table summarizes the shares repurchases made from 2018 through February 27, 2020:
Total number of shares and share equivalents purchasedAverage price paid per share and share equivalentAmounts paid for shares and share equivalents purchased (in millions)
2018 repurchases:
Shares repurchased under May 24, 2018 Accelerated Repurchase Agreement10,829,903  354  
Shares repurchased under September 5, 2018 Accelerated Repurchase Agreement13,307,130  500  
Other repurchases11,097,631  396  
Total Share Repurchases during 201835,234,664  $35.48$1,250  
2019 repurchases:
Repurchases under February 28, 2019 Accelerated Share Repurchase Agreement
9,438,671  400  
Other repurchases26,863,211  1,008  
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(a)
936,928  36  
Total Share Repurchases during 201937,238,810  $38.79  $1,444  
2020 repurchases:
Repurchases made subsequent to December 31, 2019
2,428,545  92  
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(a)
709,536  27  
Total share repurchases January 1, 2020 through February 27, 20203,138,081  $37.87  $119  
(a) NRG elected to pay cash for tax withholding on equity awards instead of issuing actual shares to management. The average price per equivalent shares withheld was $38.24 and $38.78 in 2020 and 2019, respectively. See Note 21, Stock-Based Compensation, for further discussion of the equity awards