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Asset Retirement Obligations Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity |
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2014 | $ | 2,052 |  |  | $ | 1,117 |  |  | $ | 3,169 |  |
Settlements | — |  |  | (58 | ) |  | (58 | ) |
Change in estimate | 36 |  |  | 444 |  |  | 480 |  |
Additional obligations | — |  |  | 101 |  |  | 101 |  |
Accretion (recorded to regulatory asset) | 99 |  |  | 52 |  |  | 151 |  |
Balance at September 30, 2015 | $ | 2,187 |  |  | $ | 1,656 |  |  | $ | 3,843 |  | (1)
Settlements | — |  |  | (133 | ) |  | (133 | ) |
Change in estimate | 198 |  |  | (22 | ) |  | 176 |  |
Additional obligations | — |  |  | 15 |  |  | 15 |  |
Accretion (recorded to regulatory asset) | 107 |  |  | 44 |  |  | 151 |  |
Balance at September 30, 2016 | $ | 2,492 |  |  | $ | 1,560 |  |  | $ | 4,052 |  | (1)
Note (1) The current portions of the ARO liability in the amounts of $212 million and $161 million as of September 30, 2016 and 2015, respectively, are included in Accounts payable and accrued liabilities.

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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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