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Employees - Summary of Movements in (Deficit)/Surplus (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) € 287 € (196)  
Current service cost (228) (223)  
Employee contributions 13 17  
Termination benefits expense (15) (37) € (5)
Past service costs including losses/(gains) on curtailments 18 20  
Settlements 1 7  
Actual return on plan assets 1,958 1,494  
Change in asset ceiling excluding amounts included in interest expenses (17) 2  
Interest cost (354) (445)  
Interest income 344 436  
Actuarial gain/(loss) arising from changes in demographic assumptions (4) 246  
Actuarial gain/(loss) arising from changes in financial assumptions 342 (1,414)  
Actuarial gain/(loss) arising from experience adjustments 126 (78)  
Employer contributions 394 398  
Benefit payments 0 0  
Other 1 (18)  
Currency retranslation 127 78  
Net defined benefit liability (asset) 2,993 287 (196)
UK      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 1,351 1,121  
Current service cost (127) (114)  
Employee contributions 0 0  
Termination benefits expense 0 0  
Past service costs including losses/(gains) on curtailments (1) 17  
Settlements 0 0  
Actual return on plan assets 1,092 1,109  
Change in asset ceiling excluding amounts included in interest expenses 0 0  
Interest cost (161) (208)  
Interest income 181 230  
Actuarial gain/(loss) arising from changes in demographic assumptions (2) (1)  
Actuarial gain/(loss) arising from changes in financial assumptions 225 (806)  
Actuarial gain/(loss) arising from experience adjustments 95 (67)  
Employer contributions 100 104  
Benefit payments 0 0  
Other 0 2  
Currency retranslation 126 (36)  
Net defined benefit liability (asset) 2,879 1,351 1,121
The Netherlands      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 527 425  
Current service cost (4) (3)  
Employee contributions 0 0  
Termination benefits expense 0 0  
Past service costs including losses/(gains) on curtailments 0 0  
Settlements 0 0  
Actual return on plan assets 560 206  
Change in asset ceiling excluding amounts included in interest expenses 0 0  
Interest cost (35) (55)  
Interest income 39 60  
Actuarial gain/(loss) arising from changes in demographic assumptions (6) 245  
Actuarial gain/(loss) arising from changes in financial assumptions (23) (354)  
Actuarial gain/(loss) arising from experience adjustments 32 (6)  
Employer contributions 72 12  
Benefit payments 0 0  
Other 0 (3)  
Currency retranslation 0 0  
Net defined benefit liability (asset) 1,162 527 425
Rest of world      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) (1,591) (1,742)  
Current service cost (97) (106)  
Employee contributions 13 17  
Termination benefits expense (15) (37)  
Past service costs including losses/(gains) on curtailments 19 3  
Settlements 1 7  
Actual return on plan assets 306 179  
Change in asset ceiling excluding amounts included in interest expenses (17) 2  
Interest cost (158) (182)  
Interest income 124 146  
Actuarial gain/(loss) arising from changes in demographic assumptions 4 2  
Actuarial gain/(loss) arising from changes in financial assumptions 140 (254)  
Actuarial gain/(loss) arising from experience adjustments (1) (5)  
Employer contributions 222 282  
Benefit payments 0 0  
Other 1 (17)  
Currency retranslation 1 114  
Net defined benefit liability (asset) € (1,048) € (1,591) € (1,742)