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Asset Retirement Obligations
 3 Months Ended
Dec. 31, 2011
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations

During the three months ended December 31, 2011, TVA's total ARO liability increased $37 million due to normal accretion. The increase in the liability was partially offset by ash area settlement projects that were conducted during the three months ended December 31, 2011. The nuclear and non-nuclear accretion were deferred as regulatory assets, and $14 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)
—

 
(5
)
 
(5
)
Accretion (recorded as regulatory asset)
29

 
13

 
42

Change in estimate
—

 
—

 
—

Balance at December 31, 2011
$
2,120

 
$
1,055

 
$
3,175