Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Unrealized holding gains (losses) on securities, income tax expense	$ 7	$ 4	$ 0	$ 10
Benefit plan adjustments, income tax expense (benefit)	4	3	10	11
Share of other comprehensive (loss) income from equity affiliates, income tax (benefit)	$ (7)	$ 0	$ (6)	$ (1)