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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details)			9 Months Ended
	Jun. 30, 2013 Customers	Sep. 30, 2012 Customers	Jun. 30, 2013 Credit of Customers [Member]	Jun. 30, 2013 Power Purchase Agreement Megawatts
Derivative
Number of customers that represent the percent of outstanding accounts receivable	3	3
Percent of total outstanding accounts receivables	26.00%	26.00%
Percent of operating revenue represented by TVA's largest industrial customer			5.00%
Megawatts				440

X

- Definition

Megawatts of summer net capability

+ References

No definition available.

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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