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Capital Structure (Tables)
 12 Months Ended
Dec. 31, 2025
Equity [Abstract]  
Changes in NRG's Common Shares Issued and Outstanding The following table reflects the changes in NRG's preferred and common shares issued and outstanding for each period presented:
 Preferred SharesCommon Shares
 Issued and OutstandingIssuedTreasuryOutstanding
Balance as of December 31, 2022— 423,897,001 (194,335,971)229,561,030 
Issuance of Series A Preferred Stock650,000 — — — 
Shares issued under ESPP— — 191,249 191,249 
Shares issued under LTIPs— 1,109,611 — 1,109,611 
Share repurchases— — (22,730,940)(22,730,940)
Retirement of treasury stock— (157,676,142)157,676,142 — 
Balance as of December 31, 2023650,000 267,330,470 (59,199,520)208,130,950 
Shares issued under ESPP— — 242,070 242,070 
Shares issued under LTIPs— 1,959,134 — 1,959,134 
Share repurchases— — (11,725,563)(11,725,563)
Partial settlement of Capped Call Options— — (2,588)(2,588)
Retirement of treasury stock— (64,225,546)64,225,546 — 
Balance as of December 31, 2024650,000 205,064,058 (6,460,055)198,604,003 
Shares issued under ESPP— — 175,907 175,907 
Shares issued under LTIPs— 1,792,902 — 1,792,902 
Share repurchases— — (9,971,620)(9,971,620)
Settlement of Capped Call Options(a)
— — (4,211,054)(4,211,054)
Conversions of Convertible Senior Notes— — 3,986,469 3,986,469 
Retirement of treasury stock— (7,028,345)7,028,345 — 
Balance as of December 31, 2025650,000 199,828,615 (9,452,008)190,376,607 
Shares issued under LTIPs— 707,836 — 707,836 
Share repurchases— — (656,900)(656,900)
Shares issued for the acquisition of the LSP Portfolio — 24,250,000 — 24,250,000 
Retirement of treasury stock— (340,900)340,900 — 
Balance as of January 31, 2026650,000 224,445,551 (9,768,008)214,677,543 
(a) Consists of partial settlement of 134 shares on June 2, 2025 and final settlement of 4,210,920 shares on July 8, 2025
Summary of Shares Repurchased
Total number of shares purchasedAverage price paid per shareAmounts paid for shares purchased (in millions)
2023 Repurchases:
Open market repurchases
5,054,798 $39.56 $200 
Repurchases made under the accelerated share repurchase agreements17,676,142 (a)950 
Total Share Repurchases during 202322,730,940 1,150 
(b)
2024 Repurchases:
Repurchases made under the accelerated share repurchase agreements1,163,230 (a)— 
Open market repurchases
10,562,333 87.57 925 
Total Share Repurchases during 202411,725,563 925 (c)
2025 Repurchases:
Open market repurchases9,971,620 130.58 1,302 
Shares received from the exercise of the Capped Call Options
224,585 69.38 16 
Total Share Repurchases during 202510,196,205 1,318 (d)
Repurchases made subsequent to December 31, 2025 thru January 31, 2026
656,900 151.93 100 
Total Share Repurchases made under the $3.7 billion authorization
45,309,608 $77.08 $3,493 
(a)Under the November 6, 2023 ASR, the Company received a total of 18,839,375 shares for an average price per share of $50.43, excluding the impact of the excise tax incurred. See discussion below for further information of the ASR agreements
(b)Excludes $10 million of excise tax accrued in 2023 which was paid in 2024
(c)Excludes $9 million of excise tax accrued in 2024 which was paid in 2025
(d)Excludes $11 million accrued for estimated excise tax for the year ended December 31, 2025
Schedule of Retirement of Treasury Stock The Company's accounting policy upon the formal retirement of treasury stock is to deduct its par value from common stock and to reflect any excess of cost over par value as a deduction from additional paid-in capital.
Total number of treasury shares retiredAverage price per shareCarrying value of treasury shares retired (in millions)
Shares retired during the year ended December 31, 2023157,676,142 $31.77 $5,009 
Shares retired during the year ended December 31, 202464,225,546 $41.07 $2,638 
Shares retired during the year ended December 31, 20257,028,345 $68.80 $483