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Asset Retirement Obligations | 3 Months Ended
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Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations During the three months ended December 31, 2013, TVA's total ARO liability increased $42 million. The increase in the liability resulted from accretion. This was partially offset by ash area settlement projects that were conducted during the three months ended December 31, 2013. The nuclear and non-nuclear accretion were deferred as regulatory assets, and $10 million of the related regulatory assets was amortized into expense as this amount was collected in rates.
Reconciliation of Asset Retirement Obligation Liability
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2013 | $ | 2,399 |  |  | $ | 1,089 |  |  | $ | 3,488 |  |
Settlements (ash storage areas) | — |  |  | (4 | ) |  | (4 | ) |
Accretion (recorded as regulatory asset) | 33 |  |  | 13 |  |  | 46 |  |
Balance at December 31, 2013 | $ | 2,432 |  |  | $ | 1,098 |  |  | $ | 3,530 |  | (1 | )
Note (1) The current portion of ARO in the amount of $30 million is included in Accounts payable and accrued liabilities at December 31, 2013.

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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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