XML 42 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
DEI Document
shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2018
USD ($)
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
Document Type 10-K
Document Period End Date Sep. 30, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Amendment Flag false
Entity Common Stock, Shares Outstanding | shares 0
Entity Small Business false
Entity Emerging Growth Company false
Entity Shell Company false
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Public Float | $ $ 0