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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details)			3 Months Ended
	Dec. 31, 2012 Customers	Sep. 30, 2012 Customers	Dec. 31, 2012 Credit of Customers	Dec. 31, 2012 Credit of Suppliers Suppliers	Dec. 31, 2012 Power Purchase Agreement Megawatts
Derivative
Number of customers that represent the percent of outstanding accounts receivable	2	3
Percent of total outstanding accounts receivables	18.00%	26.00%
Percent of operating revenue represented by TVA's largest industrial customer			6.00%
Number of suppliers				13
Megawatts					440