Financial Instruments (Narrative) (Details) ¥ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 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		100		100
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	8		7
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	(27)	1	(52)	17
Interest Income (Expense), Nonoperating, Net	5	5	10	6
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap
Derivative [Line Items]
Derivatives, Hedge Discontinuances, Hedging Instrument Matured, Amount		200		200
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)	$ (2)	$ (5)	$ (7)