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Pensions and other post-employment benefits - Asset Ceiling and Other (Details)
€ in Millions
12 Months Ended
Dec. 31, 2022
EUR (€)
plan
Dec. 31, 2021
EUR (€)
Pensions and Other Post-Employment Benefits    
Employer contributions expected to be paid next year € 79  
Amount transferred in excess of pension assets € 117 € 348
United States.    
Pensions and Other Post-Employment Benefits    
Total number of pension plans | plan 3  
United States Pension benefits    
Pensions and Other Post-Employment Benefits    
Percentage of total healthcare obligations for capped employees 98.00%