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Asset Retirement Obligations (Tables)
 9 Months Ended
Jun. 30, 2012
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)
—

 
(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