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v3.19.2

Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) People | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) People | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 300 | $ 299 |  | $ 300 |  |  |  |
Prior Period Reclassification Adjustment |  |  |  | 13 |  |  |  |
Deferred Costs | (6) |  |  | (6) |  |  |  |
Regulatory Assets | 6,938 | 7,026 |  | 6,938 |  |  |  |
Fuel cost tax equivalents | (8) |  |  |  |  |  |  |
Other Deferred Costs, Net | 29 |  |  | 29 |  |  |  |
Other Depreciation and Amortization | (15) |  |  |  |  |  |  |
Other Operating Activities, Cash Flow Statement | (20) |  |  |  |  |  |  |
Accounts Payable and Accrued Liabilities, Current | (12) |  |  | (12) |  |  |  |
Regulatory assets costs | (8) |  |  |  |  |  |  |
Appropriation-investment power program |  | 1,000 |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 111 | 123 |  | $ 111 |  |  |  |
Population of TVA's service area | People | 10 |  |  | 10 |  |  |  |
Allowance for uncollectible accounts | $ 1 | 1 |  | $ 1 |  |  |  |
Revenue capitalized during pre-commercial operations | 0 |  | $ 1 | 0 | $ 11 |  |  |
Fuel cost capitalized during pre-commercial operations |  | 20 | $ 5 |  |  |  |  |
Depreciation expense | 536 |  |  | 1,268 | $ 950 | $ 301 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 323 | $ 322 |  | $ 323 |  |  | $ 312 | $ 300

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