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Financial instruments - Narrative (Details) - 6 months ended Dec. 31, 2020
€ in Millions, ¥ in Millions, $ in Millions
USD ($)
EUR (€)
JPY (¥)
Debt Instrument [Line Items]      
Net (losses) and net unrealized gains relating to forward exchange contracts | $ $ 24    
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