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Cover
Dec. 19, 2020
Cover [Abstract]  
Entity Emerging Growth Company false
Document Period End Date Dec. 19, 2020
Document Type 8-K
Entity Registrant Name TENNESSEE VALLEY AUTHORITY
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 File Number 000-52313
Entity Tax Identification Number 62-0474417
Entity Address, Postal Zip Code 37902
Entity Address, State or Province TN
Entity Address, City or Town Knoxville
Entity Address, Address Line One 400 W. Summit Hill Drive
Entity Central Index Key 0001376986
Document Period End Date Dec. 19, 2020
Document Fiscal Year Focus 2021
Document Fiscal Period Focus FY
Amendment Flag false