Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	1,200.0	1,200.0
Common stock, shares issued	751.1	749.3
Common stock, shares outstanding	751.1	749.3
Common stock, units	0	3.4