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

 
(33
)
 
(33
)
 
Additional obligations
—

 
606

 
606

 
Accretion (recorded as regulatory asset)
74

 
40

 
114

 
Balance at June 30, 2015
$
2,126

 
$
1,730

 
$
3,856

(1 
) 

Note
(1) The current portion of ARO in the amount of $180 million is included in Accounts payable and accrued liabilities at June 30, 2015.