Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Jun. 30, 2015
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 1	$ 1.00
Preferred stock, shares authorized	300,000.0	300,000.0
Preferred stock, shares issued	0	0
Common stock, par value (usd per share)	$ 0.10	$ 0.10
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	638,700,000.0	638,700,000.0
Common stock, shares outstanding	463,400,000.0	466,400,000.0
Treasury stock, shares	175,300,000.0	172,300,000.0