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Provisions, income tax liabilities and other liabilities - Timing of Future Payments in Respect of Unfunded Pension and Other Post-employment Benefit Plans (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2023
EUR (€)
Disclosure of defined benefit plans [line items]  
Estimated payments € 1,238
Less than 1 year  
Disclosure of defined benefit plans [line items]  
Estimated payments 86
From 1 to 3 years  
Disclosure of defined benefit plans [line items]  
Estimated payments 117
From 3 to 5 years  
Disclosure of defined benefit plans [line items]  
Estimated payments 144
More than 5 years  
Disclosure of defined benefit plans [line items]  
Estimated payments € 891