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Loans payable and other financial liabilities - Schedule of Capped Call Transactions (Details) - USD ($) $ in Millions	Jan. 31, 2021	Nov. 30, 2020	Aug. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
2028 Notes | Convertible Senior Notes
Debt Instrument [Line Items]
Amount paid to enter into capped call transactions	$ 101	$ 120	$ 83	$ 104	$ 88

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