Financial Instruments (Narrative) (Details) ¥ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 JPY (¥)
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 0	$ 0	$ 0	$ 0
Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative Liability, Notional Amount		200		200
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	13		20	20
Interest Rate Swap
Derivative [Line Items]
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	18		18
Currency Swap [Member]
Derivative [Line Items]
Derivative Liability, Notional Amount		600		600	¥ 64,000
Foreign Exchange Contract [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	49	18	3	35
Interest Income (Expense), Nonoperating, Net	$ 5	5	14	11
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap
Derivative [Line Items]
Derivatives, Hedge Discontinuances, Hedging Instrument Matured, Amount		200		200
Derivative Liability, Notional Amount		200		200
Derivatives, Hedge Discontinuances, Heading Instrument Terminated, Amount		$ 550		550
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			$ 4	$ (7)