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Financial instruments - Narrative (Details)
€ in Millions, ¥ in Millions, $ in Millions
3 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
EUR (€)
Sep. 30, 2021
JPY (¥)
Debt Instrument [Line Items]        
Net gains relating to forward exchange contracts | $ $ 4 $ 20    
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