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Summary of Significant Accounting Policies General and Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012 variable_interest_entities People	Sep. 30, 2012
General and Basis of Presentation
Population of TVA's service area	9,000,000
Number of variable interest entities	2
Period of time for customers to fulfill payment arrangements	90 days
Allowance for uncollectible accounts, accounts receivable	$ 5	$ 7
Loans and other long-term receivables, net	80	76
Loans and other long-term receivables, allowance	$ 11	$ 12

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

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Period of time for customers to fulfill payment arrangements

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The population of the company's service area.

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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-Paragraph 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle) and amount due to the Entity from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such investments and receivables to an amount that approximates their net realizable value.

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