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Provisions, income tax liabilities and other liabilities - Service Cost for Pension and Other post-employment Benefit Plans, by Geographical Region (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
France      
Disclosure of defined benefit plans [line items]      
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) € 29 € (3) € 156
Germany      
Disclosure of defined benefit plans [line items]      
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) 135 (98) 205
US      
Disclosure of defined benefit plans [line items]      
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) 47 (25) 382
UK      
Disclosure of defined benefit plans [line items]      
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) (212) (44) (131)
Pensions and other post-employment benefits      
Disclosure of defined benefit plans [line items]      
Current service cost [1] 138 140 193
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan (110) (22) (68)
Net interest cost/(income) including administration costs and taxes paid during the period 77 78 49
Contributions from plan members [1] (5) (6) (6)
Expense/(gain) recognized directly in profit or loss [1] 100 190 168
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) [1],[2] (13) 171 (650)
Expense/(gain) for the period 87 361 (482)
Pensions and other post-employment benefits | France      
Disclosure of defined benefit plans [line items]      
Current service cost 48 50 61
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan (82) (20) (60)
Net interest cost/(income) including administration costs and taxes paid during the period 13 22 10
Contributions from plan members 0 0 0
Expense/(gain) recognized directly in profit or loss (21) 52 11
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) (31) 3 (156)
Expense/(gain) for the period (52) 55 (145)
Pensions and other post-employment benefits | Germany      
Disclosure of defined benefit plans [line items]      
Current service cost 30 30 44
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan 0 0 2
Net interest cost/(income) including administration costs and taxes paid during the period 20 15 7
Contributions from plan members 0 0 0
Expense/(gain) recognized directly in profit or loss 50 45 53
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) (134) 98 (204)
Expense/(gain) for the period (84) 143 (151)
Pensions and other post-employment benefits | US      
Disclosure of defined benefit plans [line items]      
Current service cost 22 20 50
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan (20) 1 1
Net interest cost/(income) including administration costs and taxes paid during the period 36 35 30
Contributions from plan members 0 0 0
Expense/(gain) recognized directly in profit or loss 38 56 81
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) (46) 26 (382)
Expense/(gain) for the period (8) 82 (301)
Pensions and other post-employment benefits | UK      
Disclosure of defined benefit plans [line items]      
Current service cost 0 0 0
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan 0 0 (6)
Net interest cost/(income) including administration costs and taxes paid during the period (1) (5) (7)
Contributions from plan members 0 0 0
Expense/(gain) recognized directly in profit or loss (1) (5) (13)
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) 212 44 130
Expense/(gain) for the period 211 39 117
Pensions and other post-employment benefits | Other      
Disclosure of defined benefit plans [line items]      
Current service cost 38 40 38
(Gains)/losses related to plan amendments, curtailments or settlements not specified in the terms of the plan (8) (3) (5)
Net interest cost/(income) including administration costs and taxes paid during the period 9 11 9
Contributions from plan members (5) (6) (6)
Expense/(gain) recognized directly in profit or loss 34 42 36
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) (14) 0 (38)
Expense/(gain) for the period € 20 € 42 € (2)
[1] (d) Benefit cost for the total Group including Opella on all the periods
[2] (b)Amounts recognized in Other comprehensive income (see Note D.15.7.).