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Asset Retirement Obligations | 6 Months Ended
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Mar. 31, 2012
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations During the six months ended March 31, 2012, TVA's total ARO liability increased $77 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 six months ended March 31, 2012. The nuclear and non-nuclear accretion were deferred as regulatory assets, and $27 million of the related regulatory assets were amortized into expense since these amounts were collected in rates.
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) | — |  |  | (12 | ) |  | (12 | )
Accretion (recorded as regulatory asset) | 57 |  |  | 27 |  |  | 84 |
Change in estimate | — |  |  | 5 |  |  | 5 |
Balance at March 31, 2012 | $ | 2,148 |  |  | $ | 1,067 |  |  | $ | 3,215 |

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 3: 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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