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Asset Retirement Obligations (Tables)
 9 Months Ended
Jun. 30, 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
—

 
(82
)
 
(82
)
 
Change in estimate
198

 
(79
)
 
119

 
Additional obligations
—

 
15

 
15

 
Accretion (recorded as regulatory asset)
79

 
33

 
112

 
Balance at June 30, 2016
$
2,464

 
$
1,543

 
$
4,007

(1 
) 

Note
(1) The current portion of ARO in the amount of $192 million and $161 million is included in Accounts payable and accrued liabilities at June 30, 2016 and September 30, 2015, respectively.