XML 8 R1.htm IDEA: XBRL DOCUMENT v3.21.1
Cover
Jun. 01, 2021
Dec. 08, 2020
Document Information [Line Items]    
City Area Code (865)  
Local Phone Number 632-2101  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Entity Emerging Growth Company false  
Entity Address, Postal Zip Code 37902  
Entity Address, Address Line One 400 W. Summit Hill Drive  
Entity Address, City or Town Knoxville  
Entity Address, State or Province TN  
Entity File Number 000-52313  
Entity Tax Identification Number 62-0474417  
Entity Registrant Name TENNESSEE VALLEY AUTHORITY  
Document Period End Date May 24, 2021  
Document Type 8-K  
Entity Central Index Key   0001376986
Document Fiscal Year Focus   2021
Document Fiscal Period Focus   FY
Amendment Flag   false