XML 28 R1.htm IDEA: XBRL DOCUMENT v3.21.1
DEI Document
shares in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2021
shares
Mar. 31, 2021
shares
Document Information [Line Items]    
Entity Registrant Name   TENNESSEE VALLEY AUTHORITY
Entity Central Index Key   0001376986
Current Fiscal Year End Date   --09-30
Entity Filer Category   Non-accelerated Filer
Entity Small Business   false
Entity Emerging Growth Company   false
Document Type 10-Q  
Document Period End Date Mar. 31, 2021  
Document Fiscal Year Focus   2021
Document Fiscal Period Focus   Q2
Amendment Flag   false
Entity Common Stock, Shares Outstanding 0 0
Entity Current Reporting Status   Yes
Entity Shell Company   false
Document Quarterly Report true  
Document Transition Report   false
Local Phone Number   632-2101
City Area Code   (865)
Entity Address, Postal Zip Code   37902 (Zip Code)
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 Interactive Data Current   Yes