Consolidated Statements of Financial Position (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 72	$ 68
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	1,800,000,000	1,800,000,000
Common stock, shares issued	706,761,661	700,718,785
Treasury stock, at cost, shares	41,264,918	15,643,146