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Asset Retirement Obligations Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2022
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity (in millions)
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2020 | $ | 3,278 |  |  | $ | 3,507 |  |  | $ | 6,785 |  |
Settlements | (11) |  |  | (231) |  |  | (242) |  |
Revisions in estimate | 12 |  |  | 191 |  |  | 203 |  |
Additional obligations | — |  |  | 43 |  |  | 43 |  |
Accretion (recorded as regulatory asset) | 149 |  |  | 64 |  |  | 213 |  |
Balance at September 30, 2021 | 3,428 |  |  | 3,574 |  |  | 7,002 |  | (1)
Settlements | (2) |  |  | (309) |  |  | (311) |  | (2)
Revisions in estimate | 61 |  |  | 186 |  |  | 247 |  |
Accretion (recorded as regulatory asset) | 156 |  |  | 68 |  |  | 224 |  |
Balance at September 30, 2022 | $ | 3,643 |  |  | $ | 3,519 |  |  | $ | 7,162 |  | (1)
Note (1) Includes $275 million a nd $266 million at September 30, 2022 and 2021, respectively, in Current liabilities. (2) Settlements include the change in asset retirement obligation project accruals included in Accounts payable and accrued liabilities of $20 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 https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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