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Asset Retirement Obligations
 9 Months Ended
Jun. 30, 2012
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations

During the nine months ended June 30, 2012, TVA's total ARO liability increased $116 million. The increase resulted primarily from accretion. This item was partially offset by ash area settlement projects that were conducted during the nine months ended June 30, 2012. The nuclear and non-nuclear accretion were deferred as regulatory assets, and $41 million of the related regulatory assets was amortized into expense since this amount was 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)
—

 
(13
)
 
(13
)
Accretion (recorded as regulatory asset)
86

 
43

 
129

Additional obligations
—

 
2

 
2

Change in estimate
—

 
(2
)
 
(2
)
Balance at June 30, 2012
$
2,177

 
$
1,077

 
$
3,254