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Asset Retirement Obligations (Tables)
 9 Months Ended
Jun. 30, 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)
—

 
(25
)
 
(25
)
 
Accretion (recorded as regulatory asset)
93

 
33

 
126

 
Change in estimate
48

 
—

 
48

 
Balance at June 30, 2013
$
2,349

 
$
1,089

 
$
3,438

* 

Note
* The current portion of ARO in the amount of $34 million is included in Accounts payable and accrued liabilities at June 30, 2013.