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Employees - Schedule of Cash Flow in Respect of Pensions and Similar Post-Employment Benefits (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]        
Defined Benefit   € 303 € 394  
Group cash flow in respect of pensions and similar benefits   515 584 € 601
2023 Estimate        
Disclosure of defined benefit plans [line items]        
Group cash flow in respect of pensions and similar benefits € 535      
Company contributions to funded plans        
Disclosure of defined benefit plans [line items]        
Defined Benefit   176 286 266
Defined Contribution   212 190 203
Company contributions to funded plans | 2023 Estimate        
Disclosure of defined benefit plans [line items]        
Defined Benefit 180      
Defined Contribution 225      
Benefit paid by the Company in respect of unfunded plans        
Disclosure of defined benefit plans [line items]        
Defined Benefit   € 127 € 108 € 132
Benefit paid by the Company in respect of unfunded plans | 2023 Estimate        
Disclosure of defined benefit plans [line items]        
Defined Benefit € 130