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Management - Labor Relations (Details)	12 Months Ended
	Dec. 31, 2024 numberOfEmployee
Concentration Risk [Line Items]
Number of employees	5,600
Number of hourly employees	4,300
Hourly employees represented by organized labor unions (in percent)	40.00%
Coal production generated by hourly employees represented by organized labor unions (in percent)	21.00%
Represented by Organized Labor Union | Kayenta Mine
Concentration Risk [Line Items]
Number of employees	30
Represented by Organized Labor Union | Shoal Creek
Concentration Risk [Line Items]
Number of employees	310
Represented by Organized Labor Union | Wilpinjong Mine
Concentration Risk [Line Items]
Number of employees	460
Represented by Organized Labor Union | Coppabella Mine
Concentration Risk [Line Items]
Number of employees	330
Represented by Organized Labor Union | Moorvale Mine
Concentration Risk [Line Items]
Number of employees	165
Represented by Organized Labor Union | Centurion Mine
Concentration Risk [Line Items]
Number of employees	130
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	90
Represented by Organized Labor Union | Wambo Prep Plant
Concentration Risk [Line Items]
Number of employees	20

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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/1943274/2147478785/954-310-50-2

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