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Employees - Summary of Movements in Irrecoverable Surplus (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) € 2,569 € 2,993
Currency retranslations 186 (63)
Net defined benefit liability (asset) 2,401 2,569
United Kingdom    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) 1,866 2,879
Currency retranslations 44 (99)
Net defined benefit liability (asset) 1,429 1,866
The Netherlands    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) 1,609 1,162
Currency retranslations 0 0
Net defined benefit liability (asset) 1,483 1,609
Rest of world    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) (906) (1,048)
Currency retranslations 142 36
Net defined benefit liability (asset) (511) (906)
Irrecoverable surplus    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) (234) (50)
Interest income (7) 2
Change in irrecoverable surplus in excess of interest (6) (184)
Currency retranslations (8) (2)
Net defined benefit liability (asset) (255) (234)
Irrecoverable surplus | United Kingdom    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) 0 0
Interest income 0 0
Change in irrecoverable surplus in excess of interest 0 0
Currency retranslations 0 0
Net defined benefit liability (asset) 0 0
Irrecoverable surplus | The Netherlands    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) 0 0
Interest income 0 0
Change in irrecoverable surplus in excess of interest 0 0
Currency retranslations 0 0
Net defined benefit liability (asset) 0 0
Irrecoverable surplus | Rest of world    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) (234) (50)
Interest income (7) 2
Change in irrecoverable surplus in excess of interest (6) (184)
Currency retranslations (8) (2)
Net defined benefit liability (asset) € (255) € (234)