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Asset Retirement Obligations Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2023
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity (in millions)
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2021 | $ | 3,428 |  |  | $ | 3,574 |  |  | $ | 7,002 |  |
Settlements | (2) |  |  | (309) |  |  | (311) |  |
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)
Settlements | (8) |  |  | (271) |  |  | (279) |  |
Revisions in estimate | 7 |  |  | 362 |  |  | 369 |  |
Accretion (recorded as regulatory asset) | 166 |  |  | 71 |  |  | 237 |  |
Balance at September 30, 2023 | $ | 3,808 |  |  | $ | 3,681 |  |  | $ | 7,489 |  | (1)
Note (1) Includes $272 million and $275 million at September 30, 2023 and 2022, 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 -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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