v3.26.1
Document and Entity Information
 12 Months Ended
Dec. 31, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2025
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-34129
Entity Registrant Name AXIA Energia S.A.
Entity Incorporation, State or Country Code D5
Entity Address, Address Line One 26 Graça Aranha Avenue
Entity Address, Address Line Two 19th floor, Centro,
Entity Address, Postal Zip Code 20030-900
Entity Address, City or Town Rio de Janeiro
Entity Address, Country BR
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Central Index Key 0001439124
Document Fiscal Period Focus FY
Amendment Flag false
Document Fiscal Year Focus 2025
Auditor Name PwC
Auditor Location Rio de Janeiro, RJ – Brazil
Auditor Firm ID 1351
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One Graça Aranha, 26
Entity Address, Address Line Two 19th floor,
Entity Address, Postal Zip Code CEP 20030-900
Entity Address, City or Town Rio de Janeiro
Entity Address, Country BR
Contact Personnel Name Eduardo Haiama
City Area Code (55 21)
Local Phone Number 2514-6435
Contact Personnel Email Address vfr@axia.com.br
COMMON  
Document Information [Line Items]  
Title of 12(b) Security Common Shares, no par value
Entity Common Stock, Shares Outstanding 1,975,377,219
PREFERRED  
Document Information [Line Items]  
Title of 12(b) Security Preferred Shares, no par value
PNA  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 142,559
PNB  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 266,462,114
PNC  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 589,277,795
Special Class Preferred Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 1
American Depositary Shares  
Document Information [Line Items]  
Title of 12(b) Security American Depositary Shares, evidenced by American Depositary Receipts, each representing one Common Share
Trading Symbol AXIA
Security Exchange Name NYSE
American Depository Shares, Class B  
Document Information [Line Items]  
Title of 12(b) Security American Depositary Shares, evidenced by American Depositary Receipts, each representing one Class "B1" Preferred Share
Trading Symbol AXIA PR
Security Exchange Name NYSE
American Depository Shares, Class C  
Document Information [Line Items]  
Title of 12(b) Security American Depositary Shares, evidenced by American Depositary Receipts, each representing one Class "C" Preferred Share
Trading Symbol AXIA PRC
Security Exchange Name NYSE