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Asset Retirement Obligations (Tables) | 9 Months Ended
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Jun. 30, 2015
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 (ash storage areas) | — |  |  | (33 | ) |  | (33 | ) |
Additional obligations | — |  |  | 606 |  |  | 606 |  |
Accretion (recorded as regulatory asset) | 74 |  |  | 40 |  |  | 114 |  |
Balance at June 30, 2015 | $ | 2,126 |  |  | $ | 1,730 |  |  | $ | 3,856 |  | (1 | )
Note (1) The current portion of ARO in the amount of $180 million is included in Accounts payable and accrued liabilities at June 30, 2015.

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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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