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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation € 968 € 1,039 € 943
Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 8,930 8,651 12,175
Fair value of plan assets 6,993 6,899 9,651
Effect of asset ceiling (6) (18) (15)
Net amount shown in the balance sheet at end of period 1,943 1,770 2,539
France      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 611 804 614
France | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 1,322 1,324 1,657
Fair value of plan assets 675 697 838
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 647 627 819
Germany | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 2,911 2,730 3,576
Fair value of plan assets 2,401 2,317 2,808
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 510 413 768
US | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 1,528 1,546 2,099
Fair value of plan assets 825 860 1,127
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 703 686 972
UK | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 2,174 2,080 3,414
Fair value of plan assets 2,235 2,175 3,629
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period (61) (95) (215)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 357 235 329
Other | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 995 971 1,429
Fair value of plan assets 857 850 1,249
Effect of asset ceiling (6) (18) (15)
Net amount shown in the balance sheet at end of period € 144 € 139 € 195