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Financial instruments - Narrative (Details)
€ in Millions, ¥ in Millions, $ in Millions, £ in Billions
1 Months Ended
Jul. 31, 2022
USD ($)
Mar. 31, 2023
EUR (€)
Mar. 31, 2023
JPY (¥)
Sep. 30, 2022
GBP (£)
Deal-contingent forward contracts        
Debt Instrument [Line Items]        
Notional amount of settled derivative | £       £ 6.4
Decrease in cash collateral held in credit support annex related to deal-contingent forward contracts | $ $ 250      
Currency Swap, Due November 2034        
Debt Instrument [Line Items]        
Notional amount of derivative   € 69 ¥ 2,149  
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