Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Assets:
Total available-for-sale securities	$ 0	$ 65
Fair Value, Measurements, Recurring
Assets:
Cash equivalents	200	739
Total available-for-sale securities		65
Other investments	117	116
Liabilities:
Contingent Consideration	(1)	(32)
Forward contracts	(76)	(21)
Fair Value, Measurements, Recurring | Level 1
Assets:
Cash equivalents	200	739
Total available-for-sale securities		0
Other investments	117	116
Liabilities:
Contingent Consideration	0	0
Forward contracts	0	0
Fair Value, Measurements, Recurring | Level 2
Assets:
Cash equivalents	0	0
Total available-for-sale securities		65
Other investments	0	0
Liabilities:
Contingent Consideration	0	0
Forward contracts	(76)	(21)
Fair Value, Measurements, Recurring | Level 3
Assets:
Cash equivalents	0	0
Total available-for-sale securities		0
Other investments	0	0
Liabilities:
Contingent Consideration	(1)	(32)
Forward contracts	$ 0	$ 0