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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2022

Asset Retirement Obligation [Abstract]

Asset retirement obligations

The results of the reviews and other changes in asset retirement obligations during 2022 and 2021, were as follows:

			2022						2021
(Dollars in millions)
Balance at beginning of year			$	469					$	377
Additional liabilities accrued			19						28
Revisions in estimated cash outflows			11						42
Disposition of assets			(1)						(1)
Accretion expense			26						23
Balance at end of year			$	524					$	469

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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://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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