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Pension and other post-employment benefits - Summary of information on plan assets and defined benefit obligation per country (Detail) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets € 2,636 € 2,678
Defined benefit obligation 2,219 2,288
Funded Status 416 390
- Other assets 568 554
- Other liabilities (152) (164)
Netherlands    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 325 331
Defined benefit obligation 415 426
Funded Status (90) (95)
USA    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 250 257
Defined benefit obligation 235 245
Funded Status 15 12
United Kingdom    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 1,206 1,257
Defined benefit obligation 751 790
Funded Status 455 467
Belgium    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 513 516
Defined benefit obligation 450 473
Funded Status 63 43
Other countries    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 341 317
Defined benefit obligation 368 353
Funded Status € (26) € (37)