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Asset Retirement Obligations | 6 Months Ended
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Mar. 31, 2023
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations During the six months ended March 31, 2023, TVA's total asset retirement obligations ("ARO") liability decreased $26 million as a result of settlements related to retirement projects that were conducted during the period, partially offset by periodic accretion. The nuclear and non-nuclear accretion amounts were deferred as regulatory assets. During the six months ended March 31, 2023, $94 million of the related regulatory assets were amortized into expense as these amounts were collected in rates. See Note 8 — Regulatory Assets and Liabilities. TVA maintains investment trusts to help fund its decommissioning obligations. See Note 14 — Fair Value Measurements — Investment Funds and Note 20 — Contingencies and Legal Proceedings — Contingencies — Decommissioning Costs for a discussion of the trusts' objectives and the current balances of the trusts.
Asset Retirement Obligation Activity |
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2022 | $ | 3,643 |  |  | $ | 3,519 |  |  | $ | 7,162 |  | (1)
Settlements | — |  |  | (122) |  |  | (122) |  | (2)
Revisions in estimate | 6 |  |  | (27) |  |  | (21) |  |
Accretion (recorded as regulatory asset) | 82 |  |  | 35 |  |  | 117 |  |
Balance at March 31, 2023 | $ | 3,731 |  |  | $ | 3,405 |  |  | $ | 7,136 |  | (1)
Notes (1) Includes $270 million and $275 million at March 31, 2023, and September 30, 2022, respectively, in Current liabilities. (2) Settlements include the change in asset retirement obligation project accruals included in Accounts payable and accrued liabilities of ($72) million.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI https://asc.fasb.org/subtopic&trid=2175671 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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