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Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2017 USD ($) People	Dec. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)
General and Basis of Presentation
Population of TVA's service area | People	9
Allowance for uncollectible accounts, accounts receivable	$ 1		$ 1
Loans receivable, carrying value	113		107
Allowance for loans receivable	1
Revenue capitalized during pre-commercial operations	1	$ 14
Fuel cost capitalized during pre-commercial operations	2	5
Depreciation expense	319	$ 336
Financing Receivable, Recorded Investment, Current	$ 3		$ 3

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- Definition

Fuel costs incurred during pre-commercial generation capitalized to project costs.

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The population of the company's service area.

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Population of Service Area [Line Items]

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Estimates of revenue realized from pre-commercial generation based on the guidance provided by FERC regulations. The calculated revenue is capitalized to offset project costs and is included in revenue as a contra-revenue amount

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Financing receivables that are current.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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