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Pension and other post-employment benefits - Summary of changes in the net defined benefit assets/liability remeasurement reserve (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [abstract]      
Opening balance as at 1 January € (232) € (212)  
Remeasurement of plan assets (8) (947)  
Actuarial gains and losses arising from changes in demographic assumptions 9 0  
Actuarial gains and losses arising from changes in financial assumptions (127) 882  
Taxation and Exchange rate differences 40 46  
Total Other comprehensive income movement for the year (85) (19) € 95
Closing balance € (317) € (232) € (212)