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Asset Retirement Obligations | 12 Months Ended
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Sep. 30, 2013
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations During the year ended September 30, 2013, TVA's total ARO liability increased $199 million. The increase in the liability resulted from accretion and a change in estimate. These items were partially offset by ash area settlement projects that were conducted during the year ended September 30, 2013. The nuclear and non-nuclear accretion expenses were deferred as regulatory assets, and $40 million of the related regulatory assets was amortized into expense as this amount was collected in rates. The change in estimate is a result of TVA's biennial update to its nuclear ARO in order to adjust for changes in expected labor factors, burial rates, and fuel expenses, among other factors. This review resulted in a $66 million increase to the nuclear ARO.
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 The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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