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Summary of Significant Accounting Policies General and Basis of Presentation (Details)	9 Months Ended
	Jun. 30, 2012
Population of Service Area
Population of TVA's service area	9,000,000
Number of variable interest entities	2

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- Definition

Number of variable interest entities in which TVA is the primary beneficiary.

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No definition available.

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- Definition

Today, TVA operates the nation's largest public power system and supplies power in most of Tennessee, northern Alabama, northeastern Mississippi, and southwestern Kentucky and in portions of northern Georgia, western North Carolina, and southwestern Virginia to a population of over nine million people.

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No definition available.

+ Details

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