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Asset Retirement Obligations Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2025
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity (in millions)
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2023 | $ | 3,808 |  |  | $ | 3,681 |  |  | $ | 7,489 |  |
Settlements | (4) |  |  | (253) |  |  | (257) |  |
Revisions in estimate (non-cash) | (160) |  |  | 292 |  |  | 132 |  |
Additional obligations (non-cash) | — |  |  | 3,136 |  |  | 3,136 |  |
Accretion (recorded as regulatory asset) | 170 |  |  | 136 |  |  | 306 |  |
Balance at September 30, 2024 | 3,814 |  |  | 6,992 |  |  | 10,806 |  | (1)
Settlements | (15) |  |  | (255) |  |  | (270) |  |
Revisions in estimate (non-cash) | 2 |  |  | (563) |  |  | (561) |  |
Accretion (recorded as regulatory asset) | 175 |  |  | 264 |  |  | 439 |  |
Balance at September 30, 2025 | $ | 3,976 |  |  | $ | 6,438 |  |  | $ | 10,414 |  | (1)
Note (1) Includes $313 million and $283 million at September 30, 2025 and 2024, 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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