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Financial Instruments - Narrative (Details) - 12 months ended Jun. 30, 2020
¥ in Millions, $ in Millions
USD ($)
JPY (¥)
derivative
EUR (€)
derivative
Derivative [Line Items]      
Net (losses) relating to forward exchange contracts | $ $ (27)    
Senior Notes | Senior Notes Due 2025      
Derivative [Line Items]      
Aggregate principal amount (in EUR) | €     € 700,000,000
Cross-currency swap contracts      
Derivative [Line Items]      
Notional amount of derivative settled | €     235,000,000
Notional amount of derivative   ¥ 2,149 € 359,000,000
Proceeds of derivative settled | $ $ 44    
Number of derivative instruments held | derivative   2 2