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Asset Retirement Obligations Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Asset Retirement Obligations |
Reconciliation of Asset Retirement Obligation Liability |
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2011 | $ | 2,091 |  |  | $ | 1,047 |  |  | $ | 3,138 |  |
Settlements (ash storage areas) | — |  |  | (22 | ) |  | (22 | ) |
Accretion (recorded as regulatory asset) | 117 |  |  | 55 |  |  | 172 |  |
Additional obligations | — |  |  | 2 |  |  | 2 |  |
Change in estimate | — |  |  | (1 | ) |  | (1 | ) |
Balance at September 30, 2012 | $ | 2,208 |  |  | $ | 1,081 |  |  | $ | 3,289 |  |
Settlements (ash storage areas) | — |  |  | (37 | ) |  | (37 | ) |
Accretion (recorded as regulatory asset) | 125 |  |  | 45 |  |  | 170 |  |
Additional obligations | — |  |  | — |  |  | — |  |
Change in estimate | 66 |  |  | — |  |  | 66 |  |
Balance at September 30, 2013 | $ | 2,399 |  |  | $ | 1,089 |  |  | $ | 3,488 |  | *
Note * The current portion of ARO in the amount of $16 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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