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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, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Derivatives, Fair Value    
Derivative Liability, Fair Value, Gross Liability $ 1,517 $ 1,481
Commodity derivatives under FTP
    
Derivatives, Fair Value    
Fair value   0
Commodity derivatives under FTP | Other current assets
    
Derivatives, Fair Value    
Derivative Liability, Fair Value, Gross Liability 69 100
200 million Sterling currency swap | Other long-term liabilities
    
Derivatives, Fair Value    
Fair value (15) (15)
250 million Sterling currency swap | Other long-term assets
    
Derivatives, Fair Value    
Fair value 56 51
150 million Sterling currency swap | Other long-term assets
    
Derivatives, Fair Value    
Fair value 8 10
$1.0 billion notional interest rate swap | Other long-term liabilities
    
Derivatives, Fair Value    
Fair value (987) (886)
$476 million notional interest rate swap | Other long-term liabilities
    
Derivatives, Fair Value    
Fair value (349) (300)
$42 million notional interest rate swap | Other long-term liabilities
    
Derivatives, Fair Value    
Fair value (12) (13)
Commodity contract derivatives
    
Derivatives, Fair Value    
Fair value (96) (141)
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 2
Commodity contract derivatives | Other long-term liabilities
    
Derivatives, Fair Value    
Fair value (17) (35)
Commodity contract derivatives | Accounts payable and accrued liabilities
    
Derivatives, Fair Value    
Fair value (80) (109)
Derivatives Under FTP
    
Derivatives, Fair Value    
Fair value (103) [1] (166) [1]
Derivatives Under FTP | Other current assets
    
Derivatives, Fair Value    
Fair value (69) (97)
Derivatives Under FTP | Other long-term liabilities
    
Derivatives, Fair Value    
Fair value (14) (36)
Derivatives Under FTP | Accounts payable and accrued liabilities
    
Derivatives, Fair Value    
Fair value $ (20) $ (33)
[1] Fair values of certain derivatives under the FTP that were in net liability positions totaling $69 million and $100 million at September 30, 2014 and September 30, 2013, 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.