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Commitments and Contingencies (Details) - Westmoreland - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Gain (Loss) Related to Litigation Settlement | $ (34) | $ 0 | $ (34) | $ 0
Public Utilities, General Disclosures [Line Items] |  |  |  |
Gain (Loss) Related to Litigation Settlement | $ (34) | $ 0 | $ (34) | $ 0

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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 + Details
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