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Pensions and other post-employment benefits - Defined benefit plans (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pensions and Other Post-Employment Benefits      
Defined benefit plan costs € 101 € 157 € 153
Defined contribution plan costs € 241 € 223 € 209
Untied States, Germany and United Kingdom      
Pensions and Other Post-Employment Benefits      
Percentage of total defined benefit obligation (as a percent) 91.00% 91.00%  
Percentage of total plan assets (as a percent) 90.00% 91.00%