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Management - Labor Relations (Details)	12 Months Ended
	Dec. 31, 2023 numberOfEmployee numberOfMine
Concentration Risk [Line Items]
Number of employees	5,400
Number of hourly employees	4,200
Hourly employees represented by organized labor unions (in percent)	38.00%
Coal production generated by hourly employees represented by organized labor unions (in percent)	18.00%
Number of us mines represented by unions | numberOfMine	1
Represented by Organized Labor Union | Kayenta Mine
Concentration Risk [Line Items]
Number of employees	20
Represented by Organized Labor Union | Shoal Creek
Concentration Risk [Line Items]
Number of employees	270
Represented by Organized Labor Union | Wilpinjong Mine
Concentration Risk [Line Items]
Number of employees	440
Represented by Organized Labor Union | Coppabella Mine
Concentration Risk [Line Items]
Number of employees	325
Represented by Organized Labor Union | Moorvale Mine
Concentration Risk [Line Items]
Number of employees	210
Represented by Organized Labor Union | Metropolitan Underground Mine
Concentration Risk [Line Items]
Number of employees	165
Represented by Organized Labor Union | Metropolitan Prep Plant
Concentration Risk [Line Items]
Number of employees	15
Represented by Organized Labor Union | Wambo Underground Mine
Concentration Risk [Line Items]
Number of employees	120
Represented by Organized Labor Union | Wambo Prep Plant
Concentration Risk [Line Items]
Number of employees	20
Represented by Organized Labor Union | Centurion Mine
Concentration Risk [Line Items]
Number of employees	10

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Number of US Mines Represented by Unions

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Percentage Of Coal Production Generated By Hourly Employees Represented By Organized Labor Unions

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Percentage of employees represented by organized labor unions.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481027/954-310-50-2

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