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Changes in Capital Structure (Tables)
3 Months Ended
Mar. 31, 2023
Equity [Abstract]  
Changes in NRG's common shares issued and outstanding
As of March 31, 2023 and December 31, 2022, the Company had 10,000,000 shares of preferred stock authorized and 500,000,000 shares of common stock authorized. 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— 395,408 — 395,408 
Issuance of Series A Preferred Stock 650,000 — — — 
Balance as of March 31, 2023650,000 424,292,409 (194,335,971)229,956,438