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Subsequent Events	12 Months Ended
	Sep. 30, 2011
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Redemption of Debt On October 15, 2011, TVA redeemed all of its 2008 5.00 percent electronotes® due October 15, 2023. These securities are identified by the CUSIP number 88059TEH0. The notes were redeemed at 100 percent of par value. Approximately $15 million of the 88059TEH0 electronotes® were outstanding at September 30, 2011. Liquidation of Commodity Broker-Dealer On October 31, 2011, MF Global Holding Ltd. (parent company), and its subsidiary MF Global Finance USA Inc. filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy Code. On the same date, a Securities Investor Protection Act proceeding was filed against MF Global Inc. (“MF Global”). TVA had used MF Global to clear certain trades and the MF Global Trustee has retained $33 million of TVA's cash collateral. While TVA expects to receive a substantial portion of the funds currently being held by the MF Global Trustee the timing and the amount of the funds' returns cannot be determined.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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