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Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plan Disclosure    
Regulatory assets $ 8,994 $ 9,131
Accounts payable and accrued liabilities (2,029) (1,627)
Post-retirement and post-employment benefit obligations (5,839) (5,348)
Pension Benefits
    
Defined Benefit Plan Disclosure    
Regulatory assets 4,157 3,910
Accounts payable and accrued liabilities (5) (5)
Post-retirement and post-employment benefit obligations (4,753) [1] (4,245) [1]
Other Post-retirement Benefits
    
Defined Benefit Plan Disclosure    
Regulatory assets 140 166
Accounts payable and accrued liabilities (38) (39)
Post-retirement and post-employment benefit obligations (614) [1] (617) [1]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent [Member]
    
Defined Benefit Plan Disclosure    
Postemployment benefits liability, noncurrent $ 472 $ 486
[1] Table above excludes $472 million and $486 million of post-employment benefit costs that are recorded in Post-retirement and post-employment benefit obligations on the Consolidated Balance Sheets at September 30, 2014 and 2013, respectively.