Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Unrealized holding (losses) gains on securities, income tax (benefit) expense	$ (10)	$ 0	$ 0
Benefit plan adjustments, income tax expense (benefit)	8	(14)	(11)
Share of other comprehensive (loss) income from equity affiliates, income tax expense (benefit)	$ 2	$ (7)	$ 1