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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Actuarial Assumptions (Details)
Jun. 30, 2024
Dec. 31, 2023
Switzerland    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 1.45% 1.40%
U.S. | Hourly pension | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 5.30% 4.85%
U.S. | Hourly pension | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 5.35% 4.90%
U.S. | Salaried pension    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 5.35% 4.85%
U.S. | OPEB | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 5.30% 4.85%
U.S. | OPEB | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 5.40% 4.90%
U.S. | Other benefits | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 5.25% 4.75%
U.S. | Other benefits | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 5.30% 4.85%
France | Retirements    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 3.65% 3.30%
France | Other benefits    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 3.60% 3.25%
Germany    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 3.65% 3.30%