Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 0	$ 0	$ 0	$ 0
Cash Flow Hedging [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	1	8	3	7
Foreign Exchange Contract [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	17	(27)	22	(52)
Interest Income (Expense), Nonoperating, Net	5	5	11	10
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap
Derivative [Line Items]
Derivative Liability, Notional Amount	200		200		$ 100
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	$ 2	$ (4)	$ 4	$ (5)