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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Amounts of Recognized Assets |  | $ 45 | $ 74
Gross Amounts Offset in the Balance Sheet | [1] | (36) | (49)
Net Amounts of Assets Presented in the Balance Sheet | [2] | 13 | 26
Total derivatives not subject to master netting or similar arrangement | [2] | 4 | 1
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement |  | 49 | 75
Currency Swap [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts of Recognized Assets | [3],[4] | 9 | 25
Gross Amounts Offset in the Balance Sheet | [1],[3],[4] | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | [2],[3],[4] | 9 | 25
Commodity derivatives under FTP |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts of Recognized Assets |  | 36 | 49
Gross Amounts Offset in the Balance Sheet | [1] | (36) | (49)
Net Amounts of Assets Presented in the Balance Sheet | [2] | 0 | 0
Total derivatives subject to master netting or similar arrangement [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Net Amounts of Assets Presented in the Balance Sheet | [2] | $ 9 | $ 25
[1] | Amounts primarily include counterparty netting of derivative contracts, margin account deposits for futures commission merchants transactions, and cash collateral received or paid in accordance with the accounting guidance for derivatives and hedging transactions.
[2] | There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the balance sheets.
[3] | At December 31, 2015 and September 30, 2015, there were no securities posted by a counterparty on TVA's behalf to partially secure the asset position(s) of currency swaps in accordance with the collateral requirements for these derivatives.
[4] | Letters of credit of approximately $1.1 billion were posted as collateral at both December 31, 2015 and September 30, 2015, to partially secure the liability positions of one of the currency swaps and one of the interest rate swaps in accordance with the collateral requirements for these derivatives. TVA held $20 million and $15 million cash collateral in excess of collateral requirements at December 31, 2015 and September 30, 2015, respectively. Cash collateral held in excess of collateral requirements is recorded in Restricted cash and investments with a corresponding obligation of the same amount recorded in Accounts payable and accrued liabilities.

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