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Asset Retirement Obligations (Tables)

6 Months Ended

Mar. 31, 2019

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation Activity

Asset Retirement Obligation Activity(1)
	Nuclear				Non-Nuclear				Total
Balance at September 30, 2018	$	2,989			$	1,790			$	4,779
Settlements	—				(42		)		(42		)
Revisions in estimate	—				136				136
Additional Obligation	14				—				14
Accretion (recorded as regulatory asset)	67				23				90
Balance at March 31, 2019	$	3,070			$	1,907			$	4,977

Note

(1) The current portion of ARO in the amount of $102 million and $115 million is included in Accounts payable and accrued liabilities at March 31, 2019, and September 30, 2018, respectively.

As a result of recent experience in completing settlements at certain facilities, the revisions in non-nuclear estimates increased $103 million primarily due to expected costs for asbestos abatement activities across TVA's fossil fleet. In addition, TVA approved a change in the preferred closure method for the Allen West Impoundment from closure in place to closure by removal, which resulted in a cost increase of $33 million.

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- Definition

Tabular disclosure of the carrying amount of a liability for asset retirement obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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