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Financial instruments - Narrative (Details) - 3 months ended Sep. 30, 2020
€ in Millions, ¥ in Millions, $ in Millions
USD ($)
JPY (¥)
EUR (€)
Debt Instrument [Line Items]      
Net (losses) and net unrealized gains relating to forward exchange contracts | $ $ 20    
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   ¥ 2,149 € 359