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Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure    
Regulatory assets $ 10,164 $ 10,418
Accounts payable and accrued liabilities (2,163) (2,127)
Post-retirement and post-employment benefit obligations (6,929) (7,107)
Pension Benefits    
Defined Benefit Plan Disclosure    
Defined benefit plan amounts deferred as regulatory assets actions by regulators 407 228
Regulatory assets 5,336 5,425
Accounts payable and accrued liabilities (5) (6)
Post-retirement and post-employment benefit obligations [1] (5,933) (6,021)
Other Post-retirement Benefits    
Defined Benefit Plan Disclosure    
Defined benefit plan amounts deferred as regulatory assets actions by regulators 0 0
Regulatory assets 49 140
Accounts payable and accrued liabilities (35) (37)
Post-retirement and post-employment benefit obligations [1] (536) (620)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent    
Defined Benefit Plan Disclosure    
Postemployment benefits liability, noncurrent $ 460 $ 465
[1] The table above excludes $460 million and $465 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, 2016 and 2015, respectively.