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Summary of Significant Accounting Policies Other long-term liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Other long term liabilities [Abstract] |  |
Asset Retirement Obligation, Current | $ 15 | $ 7
Unrecognized Tax Benefits | 6 | 6
Liability, Retirement and Postemployment Benefits | 8 | 8
Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent | 7 | 7
Pension benefit obligation | 2 | 1
Other long term liabilities | 23 | 25
Other long-term liabilities | $ 61 | $ 53

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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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
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