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Asset Retirement Obligations Asset Retirement Obligations (Tables)
 12 Months Ended
Sep. 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, 2011
$
2,091

 
$
1,047

 
$
3,138

 
 
 
 
 
 
 
 
Settlements (ash storage areas)
—

 
(22
)
 
(22
)
 
Accretion (recorded as regulatory asset)
117

 
55

 
172

 
Additional obligations
—

 
2

 
2

 
Change in estimate
—

 
(1
)
 
(1
)
 
 
 
 
 
 
 
 
Balance at September 30, 2012
$
2,208

 
$
1,081

 
$
3,289

 
 
 
 
 
 
 
 
Settlements (ash storage areas)
—

 
(37
)
 
(37
)
 
Accretion (recorded as regulatory asset)
125

 
45

 
170

 
Additional obligations
—

 
—

 
—

 
Change in estimate
66

 
—

 
66

 
 
 
 
 
 
 
 
Balance at September 30, 2013
$
2,399

 
$
1,089

 
$
3,488

*


Note
* The current portion of ARO in the amount of $16 million is included in Accounts payable and accrued liabilities.