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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2024

Asset Retirement Obligation [Abstract]

Asset retirement obligations

The results of the reviews and other changes in asset retirement obligations during 2024 and 2023, were as follows:

			2024						2023
(Dollars in millions)
Balance at beginning of year			$	556					$	524
Additional liabilities accrued			25						10
Revisions in estimated cash outflows			9						(3)
Disposition of assets			(11)						(4)
Accretion expense			29						29
Balance at end of year			$	608					$	556

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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
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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