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Asset Retirement Obligations (Tables) | 6 Months Ended
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Mar. 31, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity |
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2020 | $ | 3,278 |  |  | $ | 3,507 |  |  | $ | 6,785 |  | (1)
Settlements | (3) |  |  | (77) |  |  | (80) |  |
Revisions in estimate | 2 |  |  | 106 |  |  | 108 |  |
Accretion (recorded as regulatory asset) | 74 |  |  | 31 |  |  | 105 |  |
Balance at March 31, 2021 | $ | 3,351 |  |  | $ | 3,567 |  |  | $ | 6,918 |  | (1)
Note (1) Includes $271 million and $345 million at March 31, 2021, and September 30, 2020, respectively, in Current liabilities. The revisions in non-nuclear estimates increased $106 million for the six months ended March 31, 2021. These increases were primarily driven by revisions of certain CCR closure liabilities at Shawnee, Paradise, and Colbert, resulting from revised engineering estimates for construction costs, new vendor bids, modified closure designs, and expected costs associated with post-closure care of the closed areas.

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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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