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Asset Retirement Obligations Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2014
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Asset Retirement Obligations |
Asset Retirement Obligation Activity |
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2012 | $ | 2,208 |  |  | $ | 1,081 |  |  | $ | 3,289 |  |
Settlements (ash storage areas) | — |  |  | (37 | ) |  | (37 | ) |
Change in estimate (ash storage areas) | 66 |  |  | — |  |  | 66 |  |
Accretion (recorded to regulatory asset) | 125 |  |  | 45 |  |  | 170 |  |
Balance at September 30, 2013 | $ | 2,399 |  |  | $ | 1,089 |  |  | $ | 3,488 |  |
Settlements (ash storage areas) | — |  |  | (14 | ) |  | (14 | ) |
Change in estimate as a result of nuclear site-specific studies | (472 | ) |  | — |  |  | (472 | ) |
Change in estimate (ash storage areas) | — |  |  | (10 | ) |  | (10 | ) |
Accretion (recorded to regulatory asset) | 125 |  |  | 52 |  |  | 177 |  |
Balance at September 30, 2014 | $ | 2,052 |  |  | $ | 1,117 |  |  | $ | 3,169 |  | (1)
Note (1) The current portion of ARO in the amount of $80 million is 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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