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Non-Current Provisions And Other Non-Current Liabilities - Disclosure of Remeasurement of Net Defined Benefit Liability Asset (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Actuarial assumption of discount rates | Minimum      
Disclosure of net defined benefit liability (asset) [Line Items]      
Decrease in actuarial assumption 0.40%    
Increase in actuarial assumption   (0.15%)  
Actuarial assumption of discount rates | Maximum      
Disclosure of net defined benefit liability (asset) [Line Items]      
Increase in actuarial assumption 0.65% 0.40%  
Eurozone | Actuarial assumption of expected rates of inflation      
Disclosure of net defined benefit liability (asset) [Line Items]      
Increase in actuarial assumption   (0.10%)  
UKZONE | Actuarial assumption of expected rates of inflation      
Disclosure of net defined benefit liability (asset) [Line Items]      
Increase in actuarial assumption 0.10%    
Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [Line Items]      
Actuarial gains/(losses) on benefit obligations € 373 [1] € 99 [2] € 379
Plan assets | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [Line Items]      
Actuarial gains/(losses) on plan assets € (138) € 34 € (208)
[1] Includes the effects of (i) the change in discount rates (in a range between +0.40% and +0.65%) and (ii) the change in the inflation rate in the United Kingdom (+0.10%) in the first half of 2024.
[2] Includes the effects of (i) the change in discount rates (in a range between -0.15% and +0.40%) and (ii) the change in the inflation rate in the eurozone (-0.10%) in the first half of 2023.