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Employees - Summary of Movements in Irrecoverable Surplus (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) € 2,993 € 287
Currency retranslation (63) 127
Net defined benefit liability (asset) 2,569 2,993
United Kingdom    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) 2,879 1,351
Currency retranslation (99) 126
Net defined benefit liability (asset) 1,866 2,879
The Netherlands    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) 1,162 527
Currency retranslation 0 0
Net defined benefit liability (asset) 1,609 1,162
Rest of world    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) (1,048) (1,591)
Currency retranslation 36 1
Net defined benefit liability (asset) (906) (1,048)
Irrecoverable surplus    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) (50) (26)
Interest income 2 (2)
Change in irrecoverable surplus in excess of interest (184) (17)
Currency retranslation (2) (5)
Net defined benefit liability (asset) (234) (50)
Irrecoverable surplus | United Kingdom    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) 0  
Interest income 0 0
Change in irrecoverable surplus in excess of interest 0 0
Currency retranslation 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  
Interest income 0 0
Change in irrecoverable surplus in excess of interest 0 0
Currency retranslation 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) (50) (26)
Interest income 2 (2)
Change in irrecoverable surplus in excess of interest (184) (17)
Currency retranslation (2) (5)
Net defined benefit liability (asset) € (234) € (50)