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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2018

Asset Retirement Obligation Disclosure [Abstract]

Reconciliation of Changes in Asset Retirement Obligations [Table Text Block]

The following is a reconciliation of the changes in the ARO from January 1, 2017 to December 31, 2018:

(In millions)	2018				2017
AROs at beginning of period	$	28			$	25
Liabilities incurred	1				2
Accretion expense	1				1
AROs at end of period	$	30			$	28

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- References

No definition available.

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- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859

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