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Summary of Significant Accounting Policies General and Basis of Presentation (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) People | Dec. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Reclassification of Amounts on Cash Flow and Statement of Operations [Line Items] |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 509 |  | $ 500 |
Restricted Cash and Cash Equivalents | 20 |  | 21 |
Regulatory Assets | 9,816 |  | 10,375 |
Appropriation-investment power program |  |  | 1,000 |
Financing Receivable, after Allowance for Credit Loss | $ 96 |  | 93 |
Population of TVA's service area | People | 10 |  |  |
Allowance for uncollectible accounts | $ 1 |  |  |
Depreciation expense | 345 | $ 539 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 529 | 327 | $ 521 | $ 322
Cash and Cash Equivalents, Period Increase (Decrease) |  | $ 5 |  |

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