Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of fiscal year	$ 527	$ 542
Additions for tax positions of the current year	29	22	$ 15
Additions for tax positions of prior years	23	42	69
Reductions for tax positions of prior years	(8)	(48)	(42)
Settlements with tax authorities	(154)	(30)	(10)
Expiration of the statute of limitations	0	(1)	0
Balance at end of fiscal year	$ 417	$ 527	$ 542