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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended	9 Months Ended
	Jun. 30, 2012	Jul. 31, 2012 MF Global Holding Ltd.	Jun. 30, 2012 MF Global Holding Ltd.	Oct. 31, 2011 MF Global Holding Ltd.	Jun. 30, 2012 Credit of Customers	Jun. 30, 2012 Credit of Customers	Sep. 30, 2011 Credit of Customers	Jun. 30, 2012 Credit of Suppliers	Jun. 30, 2012 Power Purchase Agreement
Derivative
Collateral already posted				$ 33
Amount already recovered		$ 1	$ 8
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%	6.00%
Number of suppliers								12
Megawatts									440

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Megawatts of summer net capability

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- Definition

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

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The number of suppliers that TVA has coal contracts with.

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

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- Definition

Amount of bankruptcy claim settled.

+ References

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 90-7

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44D

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (d)

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

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