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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Cash Collateral in Excess of Collateral Requirements |  | $ 0 | $ 15
Forward Contract Derivative Liability, at Fair Value |  | (14) | 59
Gross amounts of recognized liabilities |  | 2,145 | 1,839
Gross Amounts Offset in the Balance Sheet | [1] | (55) | (138)
Net Amounts of Liabilities Presented in the Balance Sheet | [2] | 2,279 | 1,799
Total derivatives not subject to master netting or similar arrangement | [2] | 189 | 98
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement |  | 2,334 | 1,937
Currency Swap [Member] |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities | [3] | 167 | 47
Gross Amounts Offset in the Balance Sheet | [1],[3] | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | [2],[3] | 167 | 47
Interest Rate Contract [Member] |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities | [3] | 1,912 | 1,627
Gross Amounts Offset in the Balance Sheet | [1],[3] | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | [2],[3] | 1,912 | 1,627
Commodity derivatives under FTP |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 66 | 165
Gross Amounts Offset in the Balance Sheet | [1] | (55) | (138)
Net Amounts of Liabilities Presented in the Balance Sheet | [2] | 11 | 27
Total derivatives subject to master netting or similar arrangement [Member] |  |  |
Offsetting Liabilities [Line Items] |  |  |
Net Amounts of Liabilities Presented in the Balance Sheet | [2] | 2,090 | 1,701
Fair Value, Inputs, Level 2 |  |  |
Offsetting Liabilities [Line Items] |  |  |
Forward Contract Derivative Asset, at Fair Value |  | 14 |
Forward Contract Derivative Liability, at Fair Value |  |  | 59
Letter of Credit |  |  |
Offsetting Liabilities [Line Items] |  |  |
Amount of letters of credit outstanding |  | $ 1,200 | $ 1,100
[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 that are not offset in the consolidated balance sheets.
[3] | Letters of credit of approximately $1.2 billion and $1.1 billion were posted as collateral at June 30, 2016, and September 30, 2015, 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, 2016, TVA held no cash collateral in excess of collateral requirements. At September 30, 2015, TVA held $15 million of cash collateral in excess of collateral requirements. 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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