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Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 USD ($) People | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) People | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |
Prior Period Reclassification Adjustment | $ 65 |  |  | $ 13 | $ 128 |
Deferred Costs | (39) |  |  | (39) |  |
Regulatory Assets | 7,063 | $ 7,026 |  | 7,063 |  |
Fuel cost tax equivalents | (6) |  |  |  |  |
Other Deferred Costs, Net | 19 |  |  | 19 |  |
Other Depreciation and Amortization | (26) |  |  |  |  |
Other Operating Activities, Cash Flow Statement | (17) |  |  |  |  |
Accounts Payable and Accrued Liabilities, Current | (12) |  |  | (12) |  |
Regulatory assets costs | (5) |  |  |  |  |
Appropriation-investment power program |  | 1,000 |  |  |  |
Financing Receivable, Net | $ 136 | 123 |  | $ 136 |  |
Population of TVA's service area | People | 10 |  |  | 10 |  |
Allowance for uncollectible accounts | $ 1 | 1 |  | $ 1 |  |
Revenue capitalized during pre-commercial operations | 0 |  | $ 10 | 0 | 11 |
Fuel cost capitalized during pre-commercial operations |  | $ 14 | $ 11 |  |  |
Depreciation expense | $ 424 |  |  | $ 732 | $ 649 | $ 331

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