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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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