Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Unrealized holding (losses) gains on securities, income tax expense(benefit)	$ 2	$ 5	$ (8)	$ (7)
Benefit plan adjustments, income tax expense	5	2	8	6
Share of other comprehensive income (loss) from equity affiliates, income tax expense (benefit)	$ 4	$ (1)	$ 5	$ 1