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Asset Retirement Obligations (Tables)
 6 Months Ended
Mar. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Activity
Asset Retirement Obligation Activity
 
 
 
 
 
 
 
 
Nuclear
 
Non-Nuclear
 
Total
 
Balance at September 30, 2014
$
2,052

 
$
1,117

 
$
3,169

 
Settlements (ash storage areas)
—

 
(21
)
 
(21
)
 
Accretion (recorded as regulatory asset)
49

 
26

 
75

 
Balance at March 31, 2015
$
2,101

 
$
1,122

 
$
3,223

(1 
) 

Note
(1) The current portion of ARO in the amount of $115 million is included in Accounts payable and accrued liabilities at March 31, 2015.