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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Actuarial Assumptions (Details)
Jun. 30, 2020
Dec. 31, 2019
Switzerland    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.20% 0.15%
U.S. | Hourly pension | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.70% 3.15%
U.S. | Hourly pension | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.85% 3.25%
U.S. | Salaried pension    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.75% 3.25%
U.S. | OPEB | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.70% 3.20%
U.S. | OPEB | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 3.00% 3.40%
U.S. | Other benefits | Bottom of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.45% 3.00%
U.S. | Other benefits | Top of range    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 2.75% 3.20%
France | Retirements    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.95% 0.95%
France | Other benefits    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.85% 0.80%
Germany    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 1.05% 1.00%