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Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018 USD ($) People	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) People	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Accounting Policies [Abstract]
Loans receivable, carrying value	$ 129		$ 129		$ 107
Population of TVA's service area | People	9		9
Allowance for uncollectible accounts, accounts receivable	$ 1		$ 1		1
Allowance for loans receivable	1		1
Revenue capitalized during pre-commercial operations	10	$ 6	11	$ 20
Fuel cost capitalized during pre-commercial operations	11	8	14
Depreciation expense	331	$ 336	649	$ 672
Financing Receivable, Recorded Investment, Current	$ 3		$ 3		$ 3

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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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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
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
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-Section 50
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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) more than one year from the reporting date, consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Paragraph 1
-Subparagraph (SX 210.5-02.4)
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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