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Employees - Summary of Movements in (Deficit)/Surplus (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) € 2,993 € 287  
Gross service cost (186) (228)  
Employee contributions 12 13  
Special termination benefits (11) (15) € (37)
Past service costs including losses/(gains) on curtailments 0 18  
Settlements 1 1  
Actual return on plan assets (excluding amounts in net finance income/charge) (6,483) 1,958  
Change in asset ceiling excluding amounts included in interest expenses (184) (17)  
Interest cost (452) (354)  
Interest income 496 344  
Actuarial gain/(loss) arising from changes in demographic assumptions (24) (4)  
Actuarial gain/(loss) arising from changes in financial assumptions 6,914 342  
Actuarial gain/(loss) arising from experience adjustments (760) 126  
Employer contributions 303 394  
Benefit payments 0 0  
Other 13 1  
Currency retranslation (63) 127  
Net defined benefit liability (asset) 2,569 2,993 287
UK      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 2,879 1,351  
Gross service cost (86) (127)  
Employee contributions 1 0  
Special termination benefits 0 0  
Past service costs including losses/(gains) on curtailments 0 (1)  
Settlements 0 0  
Actual return on plan assets (excluding amounts in net finance income/charge) (4,870) 1,092  
Change in asset ceiling excluding amounts included in interest expenses 0 0  
Interest cost (210) (161)  
Interest income 264 181  
Actuarial gain/(loss) arising from changes in demographic assumptions 1 (2)  
Actuarial gain/(loss) arising from changes in financial assumptions 4,196 225  
Actuarial gain/(loss) arising from experience adjustments (276) 95  
Employer contributions 66 100  
Benefit payments 0 0  
Other 0 0  
Currency retranslation (99) 126  
Net defined benefit liability (asset) 1,866 2,879 1,351
The Netherlands      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 1,162 527  
Gross service cost (4) (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) (668) 560  
Change in asset ceiling excluding amounts included in interest expenses 0 0  
Interest cost (54) (35)  
Interest income 66 39  
Actuarial gain/(loss) arising from changes in demographic assumptions (50) (6)  
Actuarial gain/(loss) arising from changes in financial assumptions 1,527 (23)  
Actuarial gain/(loss) arising from experience adjustments (377) 32  
Employer contributions 8 72  
Benefit payments 0 0  
Other (1) 0  
Currency retranslation 0 0  
Net defined benefit liability (asset) 1,609 1,162 527
Rest of world      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) (1,048) (1,591)  
Gross service cost (96) (97)  
Employee contributions 11 13  
Special termination benefits (11) (15)  
Past service costs including losses/(gains) on curtailments 0 19  
Settlements 1 1  
Actual return on plan assets (excluding amounts in net finance income/charge) (945) 306  
Change in asset ceiling excluding amounts included in interest expenses (184) (17)  
Interest cost (188) (158)  
Interest income 166 124  
Actuarial gain/(loss) arising from changes in demographic assumptions 25 4  
Actuarial gain/(loss) arising from changes in financial assumptions 1,191 140  
Actuarial gain/(loss) arising from experience adjustments (107) (1)  
Employer contributions 229 222  
Benefit payments 0 0  
Other 14 1  
Currency retranslation 36 1  
Net defined benefit liability (asset) € (906) € (1,048) € (1,591)