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Asset Retirement Obligations Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Activity |
Asset Retirement Obligation Activity |
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2013 | $ | 2,399 |  |  | $ | 1,089 |  |  | $ | 3,488 |  |
Settlements (ash storage areas) | — |  |  | (14 | ) |  | (14 | ) |
Change in estimate (nuclear site - specific studies) | (472 | ) |  | — |  |  | (472 | ) |
Change in estimate (other) | — |  |  | (10 | ) |  | (10 | ) |
Accretion (recorded to regulatory asset) | 125 |  |  | 52 |  |  | 177 |  |
Balance at September 30, 2014 | $ | 2,052 |  |  | $ | 1,117 |  |  | $ | 3,169 |  | (1)
Settlements (ash storage areas) | — |  |  | (58 | ) |  | (58 | ) |
Change in estimate (coal combustion residuals rule) | — |  |  | 469 |  |  | 469 |  |
Change in estimate (nuclear license extension) | 36 |  |  | — |  |  | 36 |  |
Change in estimate (other) | — |  |  | (25 | ) |  | (25 | ) |
Additional obligations | — |  |  | 101 |  |  | 101 |  |
Accretion (recorded to regulatory asset) | 99 |  |  | 52 |  |  | 151 |  |
Balance at September 30, 2015 | $ | 2,187 |  |  | $ | 1,656 |  |  | $ | 3,843 |  | (1)
Note (1) The current portions of ARO in the amounts of $161 million and $80 million as of September 30, 2015 and 2014, 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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