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Asset Retirement Obligations
 3 Months Ended
Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations

During the three months ended December 31, 2012, TVA's total ARO liability increased $37 million. The increase resulted primarily from accretion. This item was partially offset by ash area settlement projects that were conducted during the three months ended December 31, 2012. 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, 2012
$
2,208

 
$
1,081

 
$
3,289

 
Settlements (ash storage areas)
—

 
(7
)
 
(7
)
 
Accretion (recorded as regulatory asset)
30

 
14

 
44

 
Balance at December 31, 2012
$
2,238

 
$
1,088

 
$
3,326

* 

Note
* The current portion of ARO in the amount of $35 million is included in Accounts payable and accrued liabilities.