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Benefit Plans Fair Value Measurements Using Significant Unobservable Inputs (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Defined Benefit Plan Disclosure      
Fair value of gross plan assets $ 7,951 [1],[2] $ 7,666 [1],[3]  
Fair Value, Inputs, Level 3
      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 656 633 813
Net realized/unrealized gains and losses 45 85  
Purchases, sales, issuances, and settlements (21) (17)  
Transfers in and/or out of Level 3 $ (1) [4] $ (248) [4]  
[1] Excludes a $3 million payable for collateral on loaned securities in connection with TVARS’s participation in securities lending programs.
[2] Excludes approximately $131 million in net payables associated with security purchases and sales and various other payables.
[3] Excludes approximately $141 million in net payables associated with security purchases and sales and various other payables
[4] Transfers in and out of Level 3 in 2012 were primarily due to a change in TVA's policy to classify investments with redemption restriction periods of three months or less as Level 2 and investments with more restrictive redemption terms as Level 3.