Consolidated Balance Sheets (Parentheticals) (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Common stock, par value (in Dollars per share) (in Dollars per share) (in Dollars per share) (in Dollars per share)	$ 0.00015625	$ 0.00015625
Common stock, shares authorized (in Shares) (in Shares) (in Shares)	1,280	1,280
Common stock, shares issued (in Shares) (in Shares) (in Shares)	270.1	343.5
Common stock, shares outstanding (in Shares) (in Shares) (in Shares)	260.6	266.1
Treasury stock, shares (in Shares) (in Shares) (in Shares)	9.5	77.4