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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Sensitivity Analysis on Defined Benefit Obligations (Details) - Actuarial assumption of discount rates
€ in Millions
Dec. 31, 2023
EUR (€)
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in actuarial assumption 0.50%
Decrease in actuarial assumption 0.50%
50 bp increase in discount rates € (47)
50 bp decrease in discount rates 55
France  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
50 bp increase in discount rates (6)
50 bp decrease in discount rates 7
Germany  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
50 bp increase in discount rates (5)
50 bp decrease in discount rates 5
Switzerland  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
50 bp increase in discount rates (17)
50 bp decrease in discount rates 22
United States  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
50 bp increase in discount rates (19)
50 bp decrease in discount rates € 21