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Asset Retirement Obligations (Tables)
 3 Months Ended
Dec. 31, 2014
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
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)
—

 
(8
)
 
(8
)
 
Accretion (recorded as regulatory asset)
24

 
13

 
37

 
Balance at December 31, 2014
$
2,076

 
$
1,122

 
$
3,198

(1 
) 

Note
(1) The current portion of ARO in the amount of $103 million is included in Accounts payable and accrued liabilities at December 31, 2014.