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Employees - Summary of Movements in (Deficit)/Surplus (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) € 2,569 € 2,993  
Gross service cost (128) (186)  
Employee contributions 11 12  
Special termination benefits (14) (11) € (15)
Past service costs including losses/(gains) on curtailments 3 0  
Settlements 2 1  
Actual return on plan assets (excluding amounts in net finance income/charge) 131 (6,483)  
Change in asset ceiling excluding amounts included in interest expenses (6) (184)  
Interest cost (749) (452)  
Interest income 859 496  
Actuarial gain/(loss) arising from changes in demographic assumptions 98 (24)  
Actuarial gain/(loss) arising from changes in financial assumptions (552) 6,914  
Actuarial gain/(loss) arising from experience adjustments (416) (760)  
Employer contributions 407 303  
Benefit payments 0 0  
Other 0 13  
Currency retranslation 186 (63)  
Net defined benefit liability (asset) 2,401 2,569 2,993
UK      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 1,866 2,879  
Gross service cost (42) (86)  
Employee contributions 0 1  
Special termination benefits 0 0  
Past service costs including losses/(gains) on curtailments 0 0  
Settlements 0 0  
Actual return on plan assets (excluding amounts in net finance income/charge) (227) (4,870)  
Change in asset ceiling excluding amounts included in interest expenses 0 0  
Interest cost (335) (210)  
Interest income 432 264  
Actuarial gain/(loss) arising from changes in demographic assumptions 104 1  
Actuarial gain/(loss) arising from changes in financial assumptions (243) 4,196  
Actuarial gain/(loss) arising from experience adjustments (220) (276)  
Employer contributions 50 66  
Benefit payments 0 0  
Other 0 0  
Currency retranslation 44 (99)  
Net defined benefit liability (asset) 1,429 1,866 2,879
The Netherlands      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 1,609 1,162  
Gross service cost (5) (4)  
Employee contributions 0 0  
Special termination benefits 0 0  
Past service costs including losses/(gains) on curtailments 0 0  
Settlements 0 0  
Actual return on plan assets (excluding amounts in net finance income/charge) 146 (668)  
Change in asset ceiling excluding amounts included in interest expenses 0 0  
Interest cost (135) (54)  
Interest income 194 66  
Actuarial gain/(loss) arising from changes in demographic assumptions 0 (50)  
Actuarial gain/(loss) arising from changes in financial assumptions (236) 1,527  
Actuarial gain/(loss) arising from experience adjustments (99) (377)  
Employer contributions 9 8  
Benefit payments 0 0  
Other 0 (1)  
Currency retranslation 0 0  
Net defined benefit liability (asset) 1,483 1,609 1,162
Rest of world      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) (906) (1,048)  
Gross service cost (81) (96)  
Employee contributions 11 11  
Special termination benefits (14) (11)  
Past service costs including losses/(gains) on curtailments 3 0  
Settlements 2 1  
Actual return on plan assets (excluding amounts in net finance income/charge) 212 (945)  
Change in asset ceiling excluding amounts included in interest expenses (6) (184)  
Interest cost (279) (188)  
Interest income 233 166  
Actuarial gain/(loss) arising from changes in demographic assumptions (6) 25  
Actuarial gain/(loss) arising from changes in financial assumptions (73) 1,191  
Actuarial gain/(loss) arising from experience adjustments (97) (107)  
Employer contributions 348 229  
Benefit payments 0 0  
Other 0 14  
Currency retranslation 142 36  
Net defined benefit liability (asset) € (511) € (906) € (1,048)