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Asset Retirement Obligations (Tables) | 3 Months Ended
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Dec. 31, 2020
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 | (1) |  |  | (38) |  |  | (39) |  |
Revisions in estimate | 2 |  |  | (12) |  |  | (10) |  |
Accretion (recorded as regulatory asset) | 37 |  |  | 14 |  |  | 51 |  |
Balance at December 31, 2020 | $ | 3,316 |  |  | $ | 3,471 |  |  | $ | 6,787 |  | (1)
Note (1) Includes $345 million at both December 31, 2020, and September 30, 2020, 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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