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Asset Retirement Obligations (Tables) | 9 Months Ended
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Jun. 30, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity(1) |  |  |  |  |
| Nuclear |  | Non-Nuclear |  | Total
Balance at September 30, 2019 | $ | 3,136 |  |  | $ | 2,480 |  |  | $ | 5,616 |
Settlements | — |  |  | (85) |  |  | (85) |
Revisions in estimate | — |  |  | 387 |  |  | 387 |
Accretion (recorded as regulatory asset) | 106 |  |  | 47 |  |  | 153 |
Balance at June 30, 2020 | $ | 3,242 |  |  | $ | 2,829 |  |  | $ | 6,071 |
Note (1) The current portions of the ARO liability in the amounts of $266 million and $163 million at June 30, 2020, and September 30, 2019, respectively, are included in Accounts payable and accrued liabilities. The revisions in non-nuclear estimates increased $387 million for the nine months ended June 30, 2020. In November 2019, the Tennessee Department of Environment and Conservation ("TDEC") released amendments to its regulations which govern solid waste disposal facilities, including TVA's active Coal Combustion Residuals ("CCR") facilities covered by a solid waste disposal permit and those which closed pursuant to a TDEC approved closure plan. Such facilities are generally subject to a 30-year post-closure care period during which the owner or operator must undertake certain activities, including monitoring and maintaining the facility. The amendments will, among other things, add an additional 50-year period after the end of the post-closure care period, require TVA to submit recommendations as to what activities must be performed during this 50-year period to protect human health and the environment, and require TVA to submit revised closure plans every 10 years. This regulatory revision resulted in an increase of $129 million, of which $38 million was related to operating CCR facilities and $91 million was related to inactive or closed CCR facilities. Additionally, in June 2020, based on most recent project cost data and estimates, TVA revised its AROs for certain CCR facilities at Allen Fossil Plant, resulting in an increase of $267 million.

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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