XML 59 R31.htm IDEA: XBRL DOCUMENT
v3.24.3

Asset Retirement Obligations (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2024
Asset Retirement Obligation Disclosure [Abstract] |
Asset retirement obligations |
| Asset Retirement Obligations
(Dollars in millions) |
Balance at December 31, 2023 | $ | 556 |
Additional liabilities accrued | 24 |
Revisions in estimated cash outflows | 9 |
Disposition of assets | (7) |
Accretion expense | 22 |
Balance at September 30, 2024 | $ | 604 |

X
- References No definition available. + Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration