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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.

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