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Asset Retirement Obligations (Tables)
 6 Months Ended
Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Activity
Asset Retirement Obligation Activity
 
Nuclear
 
Non-Nuclear
 
Total
 
Balance at September 30, 2015
$
2,187

 
$
1,656

 
$
3,843

 
Settlements
—

 
(48
)
 
(48
)
 
Change in estimate
—

 
(76
)
 
(76
)
 
Additional obligations
—

 
15

 
15

 
Accretion (recorded as regulatory asset)
52

 
22

 
74

 
Balance at March 31, 2016
$
2,239

 
$
1,569

 
$
3,808

(1 
) 


Note
(1) The current portion of ARO in the amount of $187 million is included in Accounts payable and accrued liabilities at March 31, 2016.