Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020
Assets:
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 0	$ 0	$ 0	$ 0
Disposal Group, Including Discontinued Operation, Liabilities	93		93		$ 0
Total assets held for sale	1,092		1,092		0
Recurring
Assets:
Cash equivalents	1,944		1,944		721
Other investments	118		118		114
Forward contracts	41		41		53
Recurring | Level 1
Assets:
Cash equivalents	1,944		1,944		721
Other investments	118		118		114
Forward contracts	0		0		0
Recurring | Level 2
Assets:
Cash equivalents	0		0		0
Other investments	0		0		0
Forward contracts	41		41		53
Recurring | Level 3
Assets:
Cash equivalents	0		0		0
Other investments	0		0		0
Forward contracts	0		0		$ 0
Fair Value, Nonrecurring
Assets:
Total assets held for sale	$ 1,100		$ 1,100