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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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- Definition The population of the company's service area. + References No definition available. + Details
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- Definition 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 + References No definition available. + Details
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