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Provisions, income tax liabilities and other liabilities - Net Liability in Respect of Pension Plans and Other Post-employment Benefits by Geographical Region (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation € 1,318 € 968 € 1,039
Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 8,229 8,930 8,651
Fair value of plan assets 6,397 6,993 6,899
Effect of asset ceiling (4) (6) (18)
Net amount shown in the balance sheet at end of period 1,836 1,943 1,770
France      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 862 611 804
France | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 1,228 1,322 1,324
Fair value of plan assets 667 675 697
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 561 647 627
Germany | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 2,651 2,911 2,730
Fair value of plan assets 2,239 2,401 2,317
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 412 510 413
US | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 1,427 1,528 1,546
Fair value of plan assets 744 825 860
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 683 703 686
UK | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 1,994 2,174 2,080
Fair value of plan assets 1,891 2,235 2,175
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 103 (61) (95)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 456 357 235
Other | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 929 995 971
Fair value of plan assets 856 857 850
Effect of asset ceiling (4) (6) (18)
Net amount shown in the balance sheet at end of period € 77 € 144 € 139