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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, subject to master netting or similar arrangements $ 6 $ 74
Gross Amounts Offset in the Balance Sheet [1] (6) (49)
Net Amounts of Assets Presented in the Balance Sheet [2] 9 26
Total derivatives not subject to master netting or similar arrangement [2] 9 1
Total 15 75
Cash collateral in excess of collateral requirements 0 15
Letter of Credit    
Offsetting Assets [Line Items]    
Amount of letters of credit outstanding 1,400 1,100
Currency Swap    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, subject to master netting or similar arrangements [3]   25
Gross Amounts Offset in the Balance Sheet [1],[3]   0
Net Amounts of Assets Presented in the Balance Sheet [2],[3]   25
Other Contract    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, subject to master netting or similar arrangements 6 49
Gross Amounts Offset in the Balance Sheet [1] (6) (49)
Net Amounts of Assets Presented in the Balance Sheet [2] 0 0
Total derivatives subject to master netting or similar arrangement    
Offsetting Assets [Line Items]    
Net Amounts of Assets Presented in the Balance Sheet [2] $ 0 $ 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] Letters of credit of approximately $1.4 billion and $1.1 billion were posted as collateral at September 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 September 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.