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Asset Retirement Obligations (Tables) | 6 Months Ended
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Mar. 31, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity(1)
| Nuclear |  | Non-Nuclear |  | Total
Balance at September 30, 2017 | $ | 2,859 |  |  | $ | 1,445 |  |  | $ | 4,304 |
Settlements | — |  |  | (42 | ) |  | (42 | )
Revisions in estimate | — |  |  | 45 |  |  | 45 |
Additional obligations | — |  |  | 1 |  |  | 1 |
Accretion (recorded as regulatory asset) | 65 |  |  | 16 |  |  | 81 |
Balance at March 31, 2018 | $ | 2,924 |  |  | $ | 1,465 |  |  | $ | 4,389 |
Note (1) The current portion of ARO in the amount of $142 million and $128 million is included in Accounts payable and accrued liabilities at March 31, 2018, and September 30, 2017, respectively.

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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