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Plant Closures (Policies) | 12 Months Ended
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Sep. 30, 2022
Property, Plant and Equipment [Abstract] |
Plant Retirement and Abandonment, Policy [Policy Text Block] | Financial Impact TVA's policy is to adjust depreciation rates to reflect the most current assumptions, ensuring units will be fully depreciated by the applicable retirement dates. As a result of TVA's decision to accelerate the retirement of Bull Run, TVA has recognized a cumulative $482 million of accelerated depreciation since the second quarter of 2019. Of this amount, $140 million, $136 million, and $125 million were recognized for the years ended September 30, 2022, 2021, and 2020, respectively. In addition, service lives for Cumberland Fossil Plant ("Cumberland"), Gallatin Fossil Plant ("Gallatin"), Kingston Fossil Plant ("Kingston"), and Shawnee Fossil Plant ("Shawnee") were shortened in a new depreciation study implemented during the first quarter of 2022 to reflect current planning assumptions to potentially retire the remainder of the coal-fired fleet by 2035. As a result, TVA recognized an estimated $339 million of additional depreciation related to these four coal-fired plants during the year ended September 30, 2022. This estimate represents the effect of using the new depreciation rates on the property, plant, and equipment balances at September 30, 2021, and does not include any potential impact from additions to or retirements of net completed plant, that occurred since September 30, 2021. For the years ended September 30, 2022, 2021, and 2020, respectively, TVA also recognized $22 million, $4 million, and $13 million in Operating and maintenance expense related to additional inventory reserves and project write-offs for the coal-fired fleet, including Bull Run.

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- Definition Disclosure of accounting policy for plant retirement and for abandonment (under construction or in use) in regulated industries when abandonment becomes probable. Any difference between the new asset and the asset cost is recognized as a loss in the income statement. May also indicate the discount rate used in the calculation of present value of recoverable abandoned assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section 35 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=6500292&loc=d3e45591-110387 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section 35 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6500292&loc=d3e45573-110387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section 35 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6500292&loc=d3e45555-110387 + Details
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