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Financial instruments - Narrative (Details)
€ in Millions, ¥ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
EUR (€)
Mar. 31, 2021
JPY (¥)
Debt Instrument [Line Items]            
Net (losses) and net unrealized gains relating to forward exchange contracts | $ $ (3) $ (48) $ 21 $ (41)    
Senior Notes | Senior Notes Due 2025            
Debt Instrument [Line Items]            
Aggregate principal amount (in EUR) | €         € 700  
Cross-currency swap contracts            
Debt Instrument [Line Items]            
Notional amount of derivative         € 359 ¥ 2,149