v3.25.4

Cover Cover	Feb. 24, 2026
Cover [Abstract]
Document Type	8-K
Entity Registrant Name	NRG ENERGY, INC.
Document Period End Date	Feb. 24, 2026
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	1301 McKinney Street
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77010
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
NYSE Texas
Cover [Abstract]
Security Exchange Name	NYSE
Entity Listings [Line Items]
Security Exchange Name	NYSE
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]
Security Exchange Name	NYSE
Title of 12(b) Security	Common Stock, par value $0.01
Trading Symbol	NRG

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Local phone number for entity.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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NRG ENERGY, INC. 8-K