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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, 2023
Dec. 31, 2022
Dec. 31, 2021
United States | Retirement Plans      
Weighted-average assumptions used to determine benefit obligations      
Discount Rate 4.84% 5.01%  
Rate of Compensation Increase 0.00% 0.00%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount Rate 5.01% 2.77% 2.32%
Expected Long-term Rate of Return 2.48% 3.27% 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 4.68% 4.92%  
Rate of Compensation Increase 3.03% 2.99%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount Rate 4.92% 2.48% 2.04%
Expected Long-term Rate of Return 2.45% 3.18% 2.01%
Rate of Compensation Increase 2.99% 3.01% 3.03%
Foreign Plans      
Weighted-average assumptions used to determine benefit obligations      
Discount Rate 4.79% 4.97%  
Rate of Compensation Increase 3.11% 3.29%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount Rate 4.97% 2.22% 1.70%
Expected Long-term Rate of Return 4.70% 3.00% 3.69%
Rate of Compensation Increase 3.29% 3.21% 3.20%