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Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2018 USD ($) People	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)
Accounting Policies [Abstract]
Appropriation-investment power program		$ 1,000
Financing Receivable, Net	$ 124	123
Population of TVA's service area | People	10
Allowance for uncollectible accounts	$ 1	1
Revenue capitalized during pre-commercial operations	0		$ 1	$ 1
Fuel cost capitalized during pre-commercial operations		$ 2
Depreciation expense	$ 308			$ 319

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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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The remaining appropriation investment if no additional appropriations from Congress are received.

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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.

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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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