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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation € 1,039 € 943 € 1,260
Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 8,651 12,175 12,456
Fair value of plan assets 6,899 9,651 9,358
Effect of asset ceiling (18) (15) (1)
Net amount shown in the balance sheet at end of period 1,770 2,539 3,099
France      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 804 614 889
France | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 1,324 1,657 1,778
Fair value of plan assets 697 838 906
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 627 819 872
Germany | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 2,730 3,576 3,580
Fair value of plan assets 2,317 2,808 2,661
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 413 768 919
US | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 1,546 2,099 2,091
Fair value of plan assets 860 1,127 1,077
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period 686 972 1,014
UK | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 2,080 3,414 3,561
Fair value of plan assets 2,175 3,629 3,536
Effect of asset ceiling 0 0 0
Net amount shown in the balance sheet at end of period (95) (215) 25
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 235 329 371
Other | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Measurement of obligation 971 1,429 1,446
Fair value of plan assets 850 1,249 1,178
Effect of asset ceiling (18) (15) (1)
Net amount shown in the balance sheet at end of period € 139 € 195 € 269