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Provisions, income tax liabilities and other liabilities - Remeasurement of Net Defined-benefit (Asset)/Liability (Actuarial Gains and Losses) (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]      
Gains/(losses) on financial assumptions € (11) € 168 € (622)
France      
Disclosure of defined benefit plans [line items]      
Actuarial gains/(losses) arising during the period 29 (3) 156
Gains/(losses) on experience adjustments [1] 18 16 (120)
Gains/(losses) on demographic assumptions 0 0 0
Gains/(losses) on financial assumptions 11 (19) 276
Germany      
Disclosure of defined benefit plans [line items]      
Actuarial gains/(losses) arising during the period 135 (98) 205
Gains/(losses) on experience adjustments [1] 46 (54) (620)
Gains/(losses) on demographic assumptions 0 0 0
Gains/(losses) on financial assumptions 89 (44) 825
US      
Disclosure of defined benefit plans [line items]      
Actuarial gains/(losses) arising during the period 47 (25) 382
Gains/(losses) on experience adjustments [1] (42) (7) (287)
Gains/(losses) on demographic assumptions 11 18 129
Gains/(losses) on financial assumptions 78 (36) 540
UK      
Disclosure of defined benefit plans [line items]      
Actuarial gains/(losses) arising during the period (212) (44) (131)
Gains/(losses) on experience adjustments [1] (472) (12) (1,328)
Gains/(losses) on demographic assumptions 50 11 54
Gains/(losses) on financial assumptions € 210 € (43) € 1,143
[1] (a)Experience adjustments are mainly due to the effect on plan assets of trends in the financial markets