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Financial instruments - Narrative (Details) - Sep. 30, 2024
€ in Millions, ¥ in Billions
EUR (€)
JPY (¥)
Currency Swap, Due November 2034    
Debt Instrument [Line Items]    
Notional amount of derivative € 69 ¥ 2.1
Currency Swap, Due May 2038    
Debt Instrument [Line Items]    
Notional amount of derivative 290  
Senior Notes | Senior Notes Due 2025    
Debt Instrument [Line Items]    
Aggregate principal amount (in EUR) € 700