Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Unrealized holding gains (losses) on securities, income tax expense	$ 4	$ 0	$ 10	$ 0
Benefit plan adjustments, income tax expense (benefit)	3	11	11	19
Share of other comprehensive income from equity affiliates, income tax expense (benefit)	$ 0	$ (2)	$ (1)	$ 2