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Employee benefit plans - Major Actuarial Assumptions Used in Determining PBO, ABO and Net Periodic Cost (Details)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
United States | Retirement Plans      
Weighted-average assumptions used to determine benefit obligations      
Discount Rate 5.52% 4.84%  
Rate of Compensation Increase 0.00% 0.00%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount Rate 4.84% 5.01% 2.77%
Expected Long-term Rate of Return 3.08% 2.48% 3.27%
Rate of Compensation Increase 0.00% 0.00% 0.00%
United States | Retiree Health and Life Insurance Plans      
Weighted-average assumptions used to determine benefit obligations      
Discount Rate 5.32% 4.68%  
Rate of Compensation Increase 3.02% 3.03%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount Rate 4.68% 4.92% 2.48%
Expected Long-term Rate of Return 3.05% 2.45% 3.18%
Rate of Compensation Increase 3.03% 2.99% 3.01%
Foreign Plans      
Weighted-average assumptions used to determine benefit obligations      
Discount Rate 6.52% 4.79%  
Rate of Compensation Increase 3.59% 3.11%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount Rate 4.79% 4.97% 2.22%
Expected Long-term Rate of Return 4.36% 4.70% 3.00%
Rate of Compensation Increase 3.11% 3.29% 3.21%