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v3.20.1

Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) People | Mar. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) People | Mar. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Reclassification of Amounts on Cash Flow and Statement of Operations [Line Items] |  |  |  |  |  |
Lease obligation related to Purchased Power [Table Text Block] |  |  | 296 |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 835 |  | $ 835 |  | $ 299 |
Restricted Cash and Cash Equivalents | 23 |  | 23 |  | 23 |
Regulatory Assets | 9,594 |  | 9,594 |  | 8,919 |
Other Deferred Costs, Net | (10) |  | (10) |  |  |
Appropriation-investment power program |  |  |  |  | 1,000 |
Financing Receivable, after Allowance for Credit Loss | $ 128 |  | $ 128 |  | 120 |
Population of TVA's service area | People | 10 |  | 10 |  |  |
Allowance for uncollectible accounts | $ 1 |  | $ 1 |  | 1 |
Depreciation expense | 407 | $ 424 | 946 | $ 732 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 858 | $ 323 | $ 858 | $ 323 | $ 322 | $ 322

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