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Asset Retirement Obligations (Tables) | 3 Months Ended
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Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2016 | $ | 2,492 |  |  | $ | 1,560 |  |  | $ | 4,052 |  |
Settlements | — |  |  | (28 | ) |  | (28 | ) |
Change in estimate | — |  |  | 20 |  |  | 20 |  |
Accretion (recorded as regulatory asset) | 29 |  |  | 8 |  |  | 37 |  |
Balance at December 31, 2016 | $ | 2,521 |  |  | $ | 1,560 |  |  | $ | 4,081 |  | (1 | )
Note (1) The current portion of ARO in the amount of $200 million and $212 million is included in Accounts payable and accrued liabilities at December 31, 2016, and September 30, 2016, 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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