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Asset Retirement Obligations Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity
| Nuclear |  | Non-Nuclear |  | Total
Balance at September 30, 2017 | $ | 2,859 |  |  | $ | 1,445 |  |  | $ | 4,304 |  |
Settlements | — |  |  | (106 | ) |  | (106 | ) |
Revisions in estimate | — |  |  | 430 |  |  | 430 |  |
Additional obligations | — |  |  | 1 |  |  | 1 |  |
Accretion (recorded to regulatory asset) | 130 |  |  | 35 |  |  | 165 |  |
Asset disposition | — |  |  | (15 | ) |  | (15 | ) |
Balance at September 30, 2018 | 2,989 |  |  | 1,790 |  |  | 4,779 |  | (1)
Settlements | (7 | ) |  | (82 | ) |  | (89 | ) |
Revisions in estimate | — |  |  | 50 |  |  | 50 |  |
Additional obligations | 18 |  |  | — |  |  | 18 |  |
Gallatin CCR | — |  |  | 672 |  |  | 672 |  |
Accretion (recorded to regulatory asset) | 136 |  |  | 50 |  |  | 186 |  |
Balance at September 30, 2019 | $ | 3,136 |  |  | $ | 2,480 |  |  | $ | 5,616 |  | (1)
Note (1) The current portions of the ARO liability in the amounts of $163 million a nd $115 million at September 30, 2019 and 2018, respectively, are included in Accounts payable and accrued liabilities.

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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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