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Asset Retirement Obligations Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2018 | $ | 2,989 |  |  | $ | 1,790 |  |  | $ | 4,779 |  |
Settlements | (7) |  |  | (82) |  |  | (89) |  |
Revisions in estimate | — |  |  | 50 |  |  | 50 |  |
Additional obligations | 18 |  |  | — |  |  | 18 |  |
Gallatin CCR | — |  |  | 672 |  |  | 672 |  |
Accretion (recorded as regulatory asset) | 136 |  |  | 50 |  |  | 186 |  |
Balance at September 30, 2019 | 3,136 |  |  | 2,480 |  |  | 5,616 |  | (1)
Settlements | (1) |  |  | (113) |  |  | (114) |  |
Revisions in estimate | — |  |  | 1,077 |  |  | 1,077 |  |
Accretion (recorded as regulatory asset) | 143 |  |  | 63 |  |  | 206 |  |
Balance at September 30, 2020 | $ | 3,278 |  |  | $ | 3,507 |  |  | $ | 6,785 |  | (1)
Note (1) Includes $345 million a nd $163 million at September 30, 2020 and 2019, respectively, in Current 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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