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DEI Document (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
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 Dec. 31, 2014
Document Fiscal Year Focus 2015
Document Fiscal Period Focus Q1
Amendment Flag false
Entity Common Stock, Shares Outstanding 0dei_EntityCommonStockSharesOutstanding
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Public Float $ 0dei_EntityPublicFloat