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Financial Instruments - Narrative (Details)
€ in Millions, ¥ in Millions, $ in Millions
12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
JPY (¥)
Jun. 30, 2020
EUR (€)
derivative
Jun. 30, 2020
JPY (¥)
derivative
Derivative [Line Items]            
Net gains (losses) relating to forward exchange contracts | $ $ 16 $ (27)        
Senior Notes | Senior Notes Due 2025            
Derivative [Line Items]            
Aggregate principal amount (in EUR)     € 700      
Cross-currency swap contracts            
Derivative [Line Items]            
Notional amount of derivative settled         € 235  
Proceeds of derivative settled | $   $ 44        
Notional amount of derivative     359 ¥ 2,149 € 359 ¥ 2,149
Number of derivative instruments held | derivative         2 2
Cross-currency swap contracts, due November 2034            
Derivative [Line Items]            
Notional amount of derivative     69 ¥ 2,149    
Cross-currency swap contracts, due May 2038            
Derivative [Line Items]            
Notional amount of derivative     € 290