XML 34 R1.htm IDEA: XBRL DOCUMENT v3.8.0.1
DEI Document
shares in Millions, $ in Millions
 6 Months Ended
Mar. 31, 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-Q
Document Period End Date Mar. 31, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus Q2
Amendment Flag false
Entity Common Stock, Shares Outstanding | shares 0
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Public Float | $ $ 0