Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized holding (losses) gains on securities, income tax expense (benefit)		$ 7	$ 8
Benefit plan adjustments, income tax benefit (expense)	$ 1	(4)	7	$ 10
Share of other comprehensive (loss) income from equity affiliates, income tax (expense) benefit	$ 3	$ 7	$ (2)	$ 6