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Cover Cover
Nov. 06, 2025
Cover [Abstract]  
Document Type 8-K
Entity Registrant Name NRG ENERGY, INC.
Document Period End Date Nov. 06, 2025
Entity Central Index Key 0001013871
Amendment Flag false
Entity Incorporation, State or Country Code DE
Entity File Number 001-15891
Entity Tax Identification Number 41-1724239
Entity Address, Address Line One 910 Louisiana Street
Entity Address, City or Town Houston
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77002
City Area Code 713
Local Phone Number 537-3000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
NEW YORK STOCK EXCHANGE, INC.  
Cover [Abstract]  
Title of 12(b) Security Common Stock, par value $0.01
Trading Symbol NRG
Security Exchange Name NYSE
Entity Listings [Line Items]  
Title of 12(b) Security Common Stock, par value $0.01
Trading Symbol NRG
Security Exchange Name NYSE
NYSE Texas  
Cover [Abstract]  
Title of 12(b) Security Common Stock, par value $0.01
Trading Symbol NRG
Security Exchange Name NYSE
Entity Listings [Line Items]  
Title of 12(b) Security Common Stock, par value $0.01
Trading Symbol NRG
Security Exchange Name NYSE