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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Offsetting Assets [Line Items] |  |  |  |
Securities Posted by Counterparty on TVA's behalf |  | $ 9 |  |
Gross Amounts of Recognized Assets |  | 116 |  | $ 115
Gross Amounts Offset in the Balance Sheet | [1] | (55) |  | (115)
Net Amounts of Assets Presented in the Balance Sheet | [2] | 64 |  | 1
Total derivatives not subject to master netting or similar arrangement | [2] | 3 |  | 1
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement |  | 119 |  | 116
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities |  | 1,622 |  | 1,517
Gross Amounts Offset in the Balance Sheet | [1] | (146) |  | (120)
Net Amounts of Liabilities Presented in the Balance Sheet | [2] | 1,604 |  | 1,494
Total derivatives not subject to master netting or similar arrangement | [2] | 128 |  | 97
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement |  | 1,750 |  | 1,614
Cash Collateral in Excess of Collateral Requirements |  | 0 |  | 19
Letter of Credit |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Amount of letters of credit outstanding |  | 1,100 |  | 1,000
Currency Swap [Member] |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross Amounts of Recognized Assets |  | 61 | [3] | 64
Gross Amounts Offset in the Balance Sheet | [1] | 0 | [3] | (64)
Net Amounts of Assets Presented in the Balance Sheet | [2] | 61 | [3] | 0
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities | [4] | 23 |  | 15
Gross Amounts Offset in the Balance Sheet | [1],[4] | 0 |  | 0
Net Amounts of Liabilities Presented in the Balance Sheet | [2],[4] | 23 |  | 15
Interest Rate Contract [Member] |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities | [4] | 1,419 |  | 1,348
Gross Amounts Offset in the Balance Sheet | [1],[4] | 0 |  | 0
Net Amounts of Liabilities Presented in the Balance Sheet | [2],[4] | 1,419 |  | 1,348
Commodity derivatives under FTP |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross Amounts of Recognized Assets |  | 55 |  | 51
Gross Amounts Offset in the Balance Sheet | [1] | (55) |  | (51)
Net Amounts of Assets Presented in the Balance Sheet | [2] | 0 |  | 0
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities |  | 180 |  | 154
Gross Amounts Offset in the Balance Sheet | [1] | (146) |  | (120)
Net Amounts of Liabilities Presented in the Balance Sheet | [2] | 34 |  | 34
Total derivatives subject to master netting or similar arrangement [Member] |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Net Amounts of Assets Presented in the Balance Sheet | [2] | 61 |  | 0
Offsetting Liabilities [Line Items] |  |  |  |
Net Amounts of Liabilities Presented in the Balance Sheet | [2] | $ 1,476 |  | $ 1,397
[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 Consolidated Balance Sheets.
[3] | At June 30, 2015, securities of approximately $9 million were 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 and $1.0 billion were posted as collateral at June 30, 2015 and September 30, 2014, respectively, 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. At June 30, 2015, TVA held no cash collateral in excess of collateral requirements and at September 30, 2014, TVA held $19 million of cash collateral in excess of collateral requirements that was classified in Restricted cash and investments with a corresponding obligation recorded in Accounts payable and accrued liabilities in the same amount.

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