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Asset Retirement Obligations (Tables) | 3 Months Ended
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Dec. 31, 2018
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 | — |  |  | (25 | ) |  | (25 | )
Accretion (recorded as regulatory asset) | 34 |  |  | 11 |  |  | 45 |
Balance at December 31, 2018 | $ | 3,023 |  |  | $ | 1,776 |  |  | $ | 4,799 |
Note (1) The current portion of ARO in the amount of $111 million and $115 million is included in Accounts payable and accrued liabilities at December 31, 2018, and September 30, 2018, respectively. On January 25, 2019, TVA approved a change in the preferred closure method for the Allen West Impoundment from closure in place to closure by removal. The cost impact of changing the closure method is expected to result in an increase of approximately $31 million to the non-nuclear AROs during the second quarter of 2019. The method of final closure for this impoundment will depend on various factors, including the completion of all environmental reviews.

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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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