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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Actuarial Assumptions (Details)
Jun. 30, 2022
Dec. 31, 2021
Switzerland    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 1.95% 0.15%
U.S. | Hourly pension | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 4.60% 2.80%
U.S. | Hourly pension | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 4.70% 2.95%
U.S. | Salaried pension    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 4.60% 2.85%
U.S. | OPEB | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 4.60% 2.85%
U.S. | OPEB | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 4.70% 2.95%
U.S. | Other benefits | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 4.45% 2.60%
U.S. | Other benefits | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 4.60% 2.85%
France | Retirements    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 3.20% 1.00%
France | Other benefits    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 3.10% 0.90%
Germany    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 3.20% 1.05%