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Asset Retirement Obligations
 3 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations

During the three months ended December 31, 2016, TVA's total ARO liability increased $29 million. During the three months ended December 31, 2016, the ARO liability increased as a result of changes in estimates and periodic accretion, partially offset by settlement projects that were conducted during these periods.  The nuclear and non-nuclear accretion expense was deferred as regulatory assets.  During the three months ended December 31, 2016, $36 million of the related regulatory assets were amortized into expense as these amounts were collected in rates. See Note 6. TVA maintains investment trusts to help fund its decommissioning obligations. See Note 13 and Note 16 — Contingencies — Decommissioning Costs for a discussion of the trusts' objectives and the current balances of the trusts.
Asset Retirement Obligation Activity
 
Nuclear
 
Non-Nuclear
 
Total
 
Balance at September 30, 2016
$
2,492

 
$
1,560

 
$
4,052

 
Settlements
—

 
(28
)
 
(28
)
 
Change in estimate
—

 
20

 
20

 
Accretion (recorded as regulatory asset)
29

 
8

 
37

 
Balance at December 31, 2016
$
2,521

 
$
1,560

 
$
4,081

(1 
) 

Note
(1) The current portion of ARO in the amount of $200 million and $212 million is included in Accounts payable and accrued liabilities at December 31, 2016, and September 30, 2016, respectively.