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Details of treasury and other financial risks - Estimated impact of 10% increase of value of the EUR on the fair value of hedges (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Details of treasury and other financial risks [Line Items]    
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR € (116)  
US Dollar [Member]    
Details of treasury and other financial risks [Line Items]    
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR (64) € (68)
Yen [Member]    
Details of treasury and other financial risks [Line Items]    
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR (15) (15)
Pound Sterling [Member]    
Details of treasury and other financial risks [Line Items]    
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR (16) (16)
Swiss Franc [Member]    
Details of treasury and other financial risks [Line Items]    
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR (5) (4)
Zloty [Member]    
Details of treasury and other financial risks [Line Items]    
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR (1) € (2)
RUB [member]    
Details of treasury and other financial risks [Line Items]    
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR € 0