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Management - Labor Relations (Details)	12 Months Ended
	Dec. 31, 2025 numberOfEmployee
Concentration Risk [Line Items]
Number of employees	5,400
Number of hourly employees	4,200
Hourly employees represented by organized labor unions (in percent)	39.00%
Coal production generated by hourly employees represented by organized labor unions (in percent)	18.00%
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	290
Represented by Organized Labor Union | Wilpinjong Mine
Concentration Risk [Line Items]
Number of employees	425
Represented by Organized Labor Union | Coppabella Mine
Concentration Risk [Line Items]
Number of employees	305
Represented by Organized Labor Union | Moorvale Mine
Concentration Risk [Line Items]
Number of employees	125
Represented by Organized Labor Union | Centurion Mine
Concentration Risk [Line Items]
Number of employees	240
Represented by Organized Labor Union | CMJV Prep Plant
Concentration Risk [Line Items]
Number of employees	10
Represented by Organized Labor Union | Metropolitan Underground Mine
Concentration Risk [Line Items]
Number of employees	190
Represented by Organized Labor Union | Metropolitan Underground Mine - Deputies
Concentration Risk [Line Items]
Number of employees	15
Represented by Organized Labor Union | Metropolitan Prep Plant
Concentration Risk [Line Items]
Number of employees	20
Represented by Organized Labor Union | Wambo Prep Plant
Concentration Risk [Line Items]
Number of employees	20

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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