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, 2018	Jun. 30, 2017	Jun. 30, 2016
Interest Rate Swaps
Derivative [Line Items]
Gain/(loss) on derivative	$ 11	$ 17	$ 23
Fixed-Rate Debt
Derivative [Line Items]
Gain/(loss) on derivative	$ (11)	$ (17)	$ (23)