Financial Instruments (Schedule of Gain/(Loss) Recognized in Earnings for Interest Rate Contracts Designated as Fair Value Hedges) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense, net	Interest expense, net	Interest expense, net
Fair Value Hedging | Interest Rate Swap
Derivative [Line Items]
Gain/(loss) on derivative	$ 51	$ 2	$ (50)
Fair Value Hedging | Fixed-Rate Debt
Derivative [Line Items]
Gain/(loss) on derivative	$ (51)	$ (2)	$ 50