v3.25.2
DEI Document
shares in Millions
9 Months Ended
Jun. 30, 2025
shares
DEI [Abstract]  
Entity Registrant Name TENNESSEE VALLEY AUTHORITY
Current Fiscal Year End Date --09-30
Entity Address, Country US
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company false
Document Type 10-Q
Document Period End Date Jun. 30, 2025
Document Fiscal Year Focus 2025
Document Fiscal Period Focus Q3
Amendment Flag false
Entity Common Stock, Shares Outstanding 0
Entity Current Reporting Status Yes
Entity Shell Company false
Document Quarterly Report true
Local Phone Number 632-2101
City Area Code (865)
Entity Tax Identification Number 62-0474417
Entity File Number 000-52313
Entity Address, Address Line One 400 W. Summit Hill Drive
Entity Address, City or Town Knoxville
Entity Address, State or Province TN
Entity Incorporation, State or Country Code X1
Entity Address, Postal Zip Code 37902
Entity Interactive Data Current Yes
Entity Central Index Key 0001376986
Entity Small Business false
Document Transition Report false
Document Information [Line Items]  
Entity Incorporation, State or Country Code X1