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Changes in Capital Structure (Tables)
 6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Changes in NRG's Preferred Stock and Commons Shares Issued and Outstanding The following table reflects the changes in NRG's preferred and common stock issued and outstanding:
PreferredCommon
Issued and OutstandingIssuedTreasuryOutstanding
Balance as of December 31, 2022— 423,897,001 (194,335,971)229,561,030 
Shares issued under LTIPs— 778,213 — 778,213 
Shares issued under ESPP— — 86,516 86,516 
Issuance of Series A Preferred Stock 650,000 — — — 
Balance as of June 30, 2023650,000 424,675,214 (194,249,455)230,425,759 
Shares issued under LTIPs— 13,812 — 13,812 
Shares repurchased— — (1,322,141)(1,322,141)
Balance as of July 31, 2023
650,000 424,689,026 (195,571,596)229,117,430