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Capital Structure (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2017418,323,134 (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 
Shares issued under ESPP— 131,469 131,469 
Shares issued under LTIPs1,167,058 — 1,167,058 
Share repurchases— (6,062,783)(6,062,783)
Balance as of December 31, 2020423,057,848 (178,825,915)244,231,933 
Summary of shares repurchased
The following table summarizes the shares repurchases made during the years 2018, 2019 and 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
6,062,783 197 
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(a)
711,248 27 
Total Share Repurchases during 20206,774,031 $33.05 $224 

(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 $38.23 and $38.78 in 2020 and 2019, respectively. See Note 22, Stock-Based Compensation, for further discussion of the equity awards