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Retirement Benefits - Assumptions (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Retirement benefits other than pension      
Defined Benefit Plan Disclosure [Line Items]      
Pension cost 5.30% 5.60% 2.90%
Benefit obligation at year end 5.70% 5.30% 5.60%
Expected return on assets 8.00% 8.00% 8.00%
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Pension cost 5.10% 5.40% 2.80%
Benefit obligation at year end 5.60% 5.10% 5.40%
Expected return on assets 7.00% 7.00% 7.00%
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Pension cost 4.90% 5.40% 2.80%
Benefit obligation at year end 5.00% 4.90% 5.40%
Expected return on assets 4.58% 4.59% 3.76%
Average rate of increase in salaries - pension cost 2.00% 1.90% 1.60%
Average rate of increase in salaries - benefit obligation at year end 1.90% 2.00% 1.90%
UMWA Plans      
Defined Benefit Plan Disclosure [Line Items]      
Pension cost 5.10% 5.40% 2.80%
Benefit obligation at year end 5.60% 5.10% 5.40%
Black Lung and Other Plans      
Defined Benefit Plan Disclosure [Line Items]      
Pension cost 5.10% 5.40% 2.70%
Benefit obligation at year end 5.50% 5.10% 5.40%