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Asset Retirement Obligations Asset Retirement Obligations (Tables)
 12 Months Ended
Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Activity
Asset Retirement Obligation Activity
 
 
 
 
 
 
 
 
 
Nuclear
 
Non-Nuclear
 
Total
 
Balance at September 30, 2013
$
2,399

 
$
1,089

 
$
3,488

 
 
 
 
 
 
 
 
Settlements (ash storage areas)
—

 
(14
)
 
(14
)
 
Change in estimate (nuclear site - specific studies)
(472
)
 
—

 
(472
)
 
Change in estimate (other)
—

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

 
52

 
177

 
 
 
 
 
 
 
 
Balance at September 30, 2014
$
2,052

 
$
1,117

 
$
3,169

(1) 
 
 
 
 
 
 
 
Settlements (ash storage areas)
—

 
(58
)
 
(58
)
 
Change in estimate (coal combustion residuals rule)
—

 
469

 
469

 
Change in estimate (nuclear license extension)
36

 
—

 
36

 
Change in estimate (other)
—

 
(25
)
 
(25
)
 
Additional obligations
—

 
101

 
101

 
Accretion (recorded to regulatory asset)
99

 
52

 
151

 
 
 
 
 
 
 
 
Balance at September 30, 2015
$
2,187

 
$
1,656

 
$
3,843

(1) 

Note
(1) The current portions of ARO in the amounts of $161 million and $80 million as of September 30, 2015 and 2014, respectively, are included in Accounts payable and accrued liabilities.