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Financial instruments - Narrative (Details)
€ in Millions, ¥ in Millions, £ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2022
GBP (£)
Mar. 31, 2022
EUR (€)
Mar. 31, 2022
JPY (¥)
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  
Forward exchange contracts              
Debt Instrument [Line Items]              
Net gains (loss) relating to forward exchange contracts | $ $ 24 $ (3) $ 47 $ 21      
Deal-contingent forward contracts              
Debt Instrument [Line Items]              
Net gains (loss) relating to forward exchange contracts | $ $ (247)   $ (396)        
Deal-contingent forward contracts | Forecast              
Debt Instrument [Line Items]              
Notional amount of derivative | £         £ 6,415    
Senior Notes | Senior Notes Due 2025              
Debt Instrument [Line Items]              
Aggregate principal amount (in EUR) | €           € 700