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Asset Retirement Obligations (Tables) | 9 Months Ended
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Jun. 30, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity(1)
| Nuclear |  | Non-Nuclear |  | Total
Balance at September 30, 2018 | $ | 2,989 |  |  | $ | 1,790 |  |  | $ | 4,779 |
Settlements | (2 | ) |  | (56 | ) |  | (58 | )
Revisions in estimate | — |  |  | 89 |  |  | 89 |
Additional obligation | 18 |  |  | — |  |  | 18 |
Gallatin CCR | — |  |  | 667 |  |  | 667 |
Accretion (recorded as regulatory asset) | 102 |  |  | 35 |  |  | 137 |
Balance at June 30, 2019 | $ | 3,107 |  |  | $ | 2,525 |  |  | $ | 5,632 |
Note (1) The current portion of ARO in the amount of $164 million and $115 million is included in Accounts payable and accrued liabilities at June 30, 2019, and September 30, 2018, respectively. The revisions in non-nuclear estimates increased $89 million for the nine months ended June 30, 2019. As a result of recent experience in completing settlements at certain facilities, costs for asbestos abatement activities across TVA's fossil fleet increased $114 million. TVA also approved a change in the preferred closure method for the Allen West Impoundment from closure-in-place to closure-by-removal, which resulted in a cost increase of $33 million. Partially offsetting these increases was a $57 million decrease in costs for Paradise closure projects. Additionally, as a result of the decision in TVA’s favor by the Sixth Circuit in the lawsuit brought by TSRA and TCWN, as well as the June 2019 consent decree filed in the case brought by TDEC, Gallatin discounted cash flows related to CCR closure and post-closure costs of $667 million have been recorded as Asset retirement obligations. The obligation is based upon the assumptions outlined in the consent decree, including a new lined facility will be permitted and constructed on the Gallatin site and existing CCR materials in the existing wet ash disposal impoundments at Gallatin will be moved to this new facility over a 20 year period. See Note 9 for additional details.

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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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