Financial Instruments (Schedule of Gain/(Loss) Recognized in Earnings for Interest Rate Contracts Designated as Fair Value Hedges) (Details) - Fair Value Hedging - Interest Expense, Net - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Interest Rate Swaps
Derivative [Line Items]
Gain/(loss) on derivative	$ (8)	$ 106	$ 9
Fixed-Rate Debt
Derivative [Line Items]
Gain/(loss) on derivative	$ 8	$ (106)	$ (9)