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Employees - Schedule of Cash Flow in Respect of Pensions and Similar Post-Employment Benefits (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2026
EUR (€)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Disclosure of defined benefit plans [line items]          
Group cash flow in respect of pensions and similar benefits   € 368 € 351 € 554  
Future Estimate          
Disclosure of defined benefit plans [line items]          
Group cash flow in respect of pensions and similar benefits € 360        
Company contributions to funded plans          
Disclosure of defined benefit plans [line items]          
Defined Benefit   65 49 260  
Defined Contribution   196 197 186  
Company contributions to funded plans | United States of America          
Disclosure of defined benefit plans [line items]          
Defined Benefit | $         $ 110
Company contributions to funded plans | Netherlands          
Disclosure of defined benefit plans [line items]          
Refund from plan   118 115    
Company contributions to funded plans | Future Estimate          
Disclosure of defined benefit plans [line items]          
Defined Benefit 55        
Defined Contribution 205        
Company contributions to funded plans | Future Estimate | Netherlands          
Disclosure of defined benefit plans [line items]          
Refund from plan 115        
Company contributions to funded plans | Future Estimate | United Kingdom          
Disclosure of defined benefit plans [line items]          
Defined Benefit 0        
Benefit paid by the Company in respect of unfunded plans          
Disclosure of defined benefit plans [line items]          
Defined Benefit   € 107 € 105 € 108  
Benefit paid by the Company in respect of unfunded plans | Future Estimate          
Disclosure of defined benefit plans [line items]          
Defined Benefit € 100