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Asset Retirement Obligations Asset Retirement Obligations (Tables)
 12 Months Ended
Sep. 30, 2016
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
—

 
(58
)
 
(58
)
 
Change in estimate
36

 
444

 
480

 
Additional obligations
—

 
101

 
101

 
Accretion (recorded to regulatory asset)
99

 
52

 
151

 
 
 
 
 
 
 
 
Balance at September 30, 2015
$
2,187

 
$
1,656

 
$
3,843

(1) 
 
 
 
 
 
 
 
Settlements
—

 
(133
)
 
(133
)
 
Change in estimate
198

 
(22
)
 
176

 
Additional obligations
—

 
15

 
15

 
Accretion (recorded to regulatory asset)
107

 
44

 
151

 
 
 
 
 
 
 
 
Balance at September 30, 2016
$
2,492

 
$
1,560

 
$
4,052

(1) 

Note
(1) The current portions of the ARO liability in the amounts of $212 million and $161 million as of September 30, 2016 and 2015, respectively, are included in Accounts payable and accrued liabilities.