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Employees - Summary of Movements in Irrecoverable Surplus (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) € 287 € (196)
Currency retranslation 127 78
Net defined benefit liability (asset) 2,993 287
United Kingdom    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) 1,351 1,121
Currency retranslation 126 (36)
Net defined benefit liability (asset) 2,879 1,351
The Netherlands    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) 527 425
Currency retranslation 0 0
Net defined benefit liability (asset) 1,162 527
Rest of world    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) (1,591) (1,742)
Currency retranslation 1 114
Net defined benefit liability (asset) (1,048) (1,591)
Irrecoverable Surplus    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) (26) (37)
Interest income (2) (1)
Change in irrecoverable surplus in excess of interest (17) 2
Currency retranslation (5) 10
Net defined benefit liability (asset) (50) (26)
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) (26) (37)
Interest income (2) (1)
Change in irrecoverable surplus in excess of interest (17) 2
Currency retranslation (5) 10
Net defined benefit liability (asset) € (50) € (26)