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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Sensitivity Analysis on Defined Benefit Obligations (Details) - Actuarial assumption of discount rates
€ in Millions
Dec. 31, 2021
EUR (€)
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
50 bp increase in discount rates € (75)
50 bp decrease in discount rates 81
France  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
50 bp increase in discount rates (10)
50 bp decrease in discount rates 10
Germany  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
50 bp increase in discount rates (7)
50 bp decrease in discount rates 8
Switzerland  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
50 bp increase in discount rates (24)
50 bp decrease in discount rates 25
United States  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
50 bp increase in discount rates (34)
50 bp decrease in discount rates € 38