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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Actuarial Assumptions (Details)
Jun. 30, 2021
Dec. 31, 2020
Switzerland    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.20% 0.00%
U.S.    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.00% 0.00%
U.S. | Hourly pension | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.75% 2.45%
U.S. | Hourly pension | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.95% 2.65%
U.S. | Salaried pension    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.85% 2.55%
U.S. | OPEB | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.85% 2.50%
U.S. | OPEB | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 3.15% 2.80%
U.S. | Other benefits | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.50% 2.20%
U.S. | Other benefits | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.90% 2.55%
France    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.00% 0.00%
France | Retirements    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.90% 0.50%
France | Other benefits    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.75% 0.40%
Germany    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.95% 0.55%