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Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan Disclosure    
Regulatory assets $ 10,418 $ 8,994
Accounts payable and accrued liabilities (2,127) (2,050)
Post-retirement and post-employment benefit obligations (7,107) (5,839)
Pension Benefits    
Defined Benefit Plan Disclosure    
Defined benefit plan amounts deferred as regulatory assets actions by regulators 228 0
Regulatory assets 5,425 4,157
Accounts payable and accrued liabilities (6) (5)
Post-retirement and post-employment benefit obligations [1] (6,021) (4,753)
Other Post-retirement Benefits    
Defined Benefit Plan Disclosure    
Defined benefit plan amounts deferred as regulatory assets actions by regulators 0 0
Regulatory assets 140 140
Accounts payable and accrued liabilities (37) (38)
Post-retirement and post-employment benefit obligations [1] (620) (614)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent [Member]    
Defined Benefit Plan Disclosure    
Postemployment benefits liability, noncurrent $ 465 $ 472
[1] Table above excludes $465 million and $472 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, 2015 and 2014, respectively.