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Asset Retirement Obligations (Tables)
 6 Months Ended
Mar. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
Asset Retirement Obligations
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)
—

 
(15
)
 
(15
)
 
Accretion (recorded as regulatory asset)
61

 
20

 
81

 
Balance at March 31, 2013
$
2,269

 
$
1,086

 
$
3,355

* 

Note
* The current portion of ARO in the amount of $31 million is included in Accounts payable and accrued liabilities.