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Asset Retirement Obligations (Tables)
 9 Months Ended
Jun. 30, 2014
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
Asset Retirement Obligations
Asset Retirement Obligation Activity
 
 
 
 
 
 
 
 
Nuclear
 
Non-Nuclear
 
Total
 
Balance at September 30, 2013
$
2,399

 
$
1,089

 
$
3,488

 
Settlements (ash storage areas)
—

 
(10
)
 
(10
)
 
Change in estimate as a result of nuclear site-specific studies
(471
)
 
—

 
(471
)
 
Change in estimate (ash storage areas)
—

 
(10
)
 
(10
)
 
Accretion (recorded as regulatory asset)
100

 
39

 
139

 
Balance at June 30, 2014
$
2,028

 
$
1,108

 
$
3,136

(1 
) 

Note
(1) The current portion of ARO in the amount of $69 million is included in Accounts payable and accrued liabilities at June 30, 2014.