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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Mark-to-Market Values of TVA Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Derivatives, Fair Value    
Derivative Liability, Fair Value $ 1,839 $ 1,517
Commodity derivatives under FTP | Other current assets    
Derivatives, Fair Value    
Derivative Liability, Fair Value 89 69
200 million Sterling currency swap | Other long-term liabilities    
Derivatives, Fair Value    
Fair value (41) (15)
250 million Sterling currency swap | Other long-term assets    
Derivatives, Fair Value    
Fair value 25 56
150 million Sterling currency swap | Other long-term assets    
Derivatives, Fair Value    
Fair value   8
150 million Sterling currency swap | Other long-term liabilities    
Derivatives, Fair Value    
Fair value (6)  
$1.0 billion notional interest rate swap | Other long-term liabilities    
Derivatives, Fair Value    
Fair value (1,177) (987)
$476 million notional interest rate swap | Other long-term liabilities    
Derivatives, Fair Value    
Fair value (438) (349)
$42 million notional interest rate swap | Other long-term liabilities    
Derivatives, Fair Value    
Fair value (12) (12)
Commodity contract derivatives    
Derivatives, Fair Value    
Fair value (97) (96)
Commodity contract derivatives | Other long-term assets    
Derivatives, Fair Value    
Fair value 1  
Commodity contract derivatives | Other current assets    
Derivatives, Fair Value    
Fair value   1
Commodity contract derivatives | Other long-term liabilities    
Derivatives, Fair Value    
Fair value (17) (17)
Commodity contract derivatives | Accounts payable and accrued liabilities    
Derivatives, Fair Value    
Fair value (81) (80)
Derivatives Under FTP    
Derivatives, Fair Value    
Fair value [1] (116) (103)
Derivatives Under FTP | Other current assets    
Derivatives, Fair Value    
Fair value (89) (69)
Derivatives Under FTP | Other long-term liabilities    
Derivatives, Fair Value    
Fair value (10) (14)
Derivatives Under FTP | Accounts payable and accrued liabilities    
Derivatives, Fair Value    
Fair value $ (17) $ (20)
[1] Fair values of certain derivatives under the FTP that were in net liability positions totaling $89 million and $69 million at September 30, 2015 and September 30, 2014, respectively, are recorded in TVA's margin cash accounts in Other current assets. These derivatives are transacted with futures commission merchants, and cash deposits have been posted to the margin cash accounts held with each futures commission merchant to offset the net liability positions in full.