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Asset Retirement Obligations (Tables)

3 Months Ended

Dec. 31, 2017

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation Activity

Asset Retirement Obligation Activity(1)
	Nuclear				Non-Nuclear				Total
Balance at September 30, 2017	$	2,859			$	1,445			$	4,304
Settlements	—				(25		)		(25		)
Revisions in estimate	—				46				46
Accretion (recorded as regulatory asset)	32				8				40
Balance at December 31, 2017	$	2,891			$	1,474			$	4,365

Note

(1) The current portion of ARO in the amount of $159 million and $128 million is included in Accounts payable and accrued liabilities at December 31, 2017, and September 30, 2017, respectively.

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- References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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