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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details)			6 Months Ended
	Mar. 31, 2013 Customers	Sep. 30, 2012 Customers	Mar. 31, 2013 Credit of Customers	Mar. 31, 2013 Credit of Suppliers Suppliers	Mar. 31, 2013 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			5.00%
Number of suppliers				11
Megawatts					440

X

- Definition

Megawatts of summer net capability

+ References

No definition available.

+ Details

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X

- Definition

The number of customers that represent the percent of outstanding accounts receivable.

+ References

No definition available.

+ Details

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- Definition

The number of suppliers.

+ References

No definition available.

+ Details

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X

- Definition

The percent of total outstanding accounts receivables represented by a certain number of customers.

+ References

No definition available.

+ Details

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- Details

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- Definition

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

+ Details

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