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Asset Retirement Obligations Asset Retirement Obligations (Tables)
 12 Months Ended
Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Activity
Asset Retirement Obligation Activity
 
Nuclear
 
Non-Nuclear
 
Total
Balance at September 30, 2017
$
2,859

 
$
1,445

 
$
4,304

 
Settlements
—

 
(106
)
 
(106
)
 
Revisions in estimate
—

 
430

 
430

 
Additional obligations
—

 
1

 
1

 
Accretion (recorded to regulatory asset)
130

 
35

 
165

 
Asset disposition
—

 
(15
)
 
(15
)
 
Balance at September 30, 2018
2,989

 
1,790

 
4,779

(1) 
Settlements
(7
)
 
(82
)
 
(89
)
 
Revisions in estimate
—

 
50

 
50

 
Additional obligations
18

 
—

 
18

 
Gallatin CCR
—

 
672

 
672

 
Accretion (recorded to regulatory asset)
136

 
50

 
186

 
Balance at September 30, 2019
$
3,136

 
$
2,480

 
$
5,616

(1) 

Note
(1) The current portions of the ARO liability in the amounts of $163 million and $115 million at September 30, 2019 and 2018, respectively, are included in Accounts payable and accrued liabilities.