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Pension Plans and Similar Obligations - Present Value of the DBO and the Fair Value of the Plan Assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Pension Plans and Similar Obligations    
Present value of the DBO € 1,737 € 2,078
Fair value of the plan assets 1,623 1,852
Net defined benefit liability (asset) € 177 € 226
% of Non-current other financial assets 0.00% 0.00%
% of Non-current provisions 54.00% 65.00%
Germany    
Pension Plans and Similar Obligations    
Present value of the DBO € 949 € 1,194
Fair value of the plan assets 953 1,183
Net defined benefit liability (asset) € 0 € 11
% of Non-current other financial assets 0.00% 0.00%
% of Non-current provisions 0.00% 3.00%
Present value of the DBO provides for lumpsum Payments € 899 € 1,125
Foreign Countries [Member]    
Pension Plans and Similar Obligations    
Present value of the DBO 577 667
Fair value of the plan assets 579 578
Net defined benefit liability (asset) € 57 € 89
% of Non-current other financial assets 0.00% 0.00%
% of Non-current provisions 20.00% 27.00%
Present value of the DBO provides for Annuity Payments € 448 € 524
Other Foreign Post Employment Plans    
Pension Plans and Similar Obligations    
Present value of the DBO 211 217
Fair value of the plan assets 91 91
Net defined benefit liability (asset) € 120 € 126
% of Non-current other financial assets 0.00% 0.00%
% of Non-current provisions 33.00% 35.00%