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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2022
Asset Retirement Obligation Disclosure [Abstract] |
Asset retirement obligations | The results of the review and other changes in asset retirement obligations during the nine months ended September 30, 2022 were as follows:
| Asset Retirement Obligations
(Dollars in millions) |
Balance at December 31, 2021 | $ | 315 |
Additional liabilities accrued | 3 |
Revisions in estimated cash outflows | 12 |
Disposition of assets | (1) |
Accretion expense | 13 |
Balance at September 30, 2022 | $ | 342 |

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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 + Details
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