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Asset Retirement Obligations Asset Retirement Obligations (Tables)
 12 Months Ended
Sep. 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, 2012
$
2,208

 
$
1,081

 
$
3,289

 
 
 
 
 
 
 
 
Settlements (ash storage areas)
—

 
(37
)
 
(37
)
 
Change in estimate (ash storage areas)
66

 
—

 
66

 
Accretion (recorded to regulatory asset)
125

 
45

 
170

 
 
 
 
 
 
 
 
Balance at September 30, 2013
$
2,399

 
$
1,089

 
$
3,488

 
 
 
 
 
 
 
 
Settlements (ash storage areas)
—

 
(14
)
 
(14
)
 
Change in estimate as a result of nuclear site-specific studies
(472
)
 
—

 
(472
)
 
Change in estimate (ash storage areas)
—

 
(10
)
 
(10
)
 
Accretion (recorded to regulatory asset)
125

 
52

 
177

 
 
 
 
 
 
 
 
Balance at September 30, 2014
$
2,052

 
$
1,117

 
$
3,169

(1) 


Note
(1) The current portion of ARO in the amount of $80 million is included in Accounts payable and accrued liabilities.