Common and Preferred Stock (Details) - $ / shares	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Class of Stock Disclosures [Abstract]
Shares of common stock reserved for issuance under stock-based compensation plans	48,300,000
Common shares repurchased	12,500,000	43,100,000
Treasury shares re-issued	700,000	1,100,000
Shares of preferred stock authorized	5,400,000	5,400,000
Par value of preferred stocked authorized	$ 2.50	$ 2.50
Shares of preferred stock issued	0	0