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Financial Instruments (Narrative) (Details) € in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 EUR (€)
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 0	$ 0	$ 0	$ 0
Currency Swap [Member]
Derivative [Line Items]
Derivative Liability, Notional Amount \| €					€ 200
Designated as Hedging Instrument \| Fair Value Hedging \| Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount		$ 650		650
Other Nonoperating Income (Expense) [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net			$ 8	$ 9