Consolidated Statements of Financial Position (Parenthetical) (USD $) In Millions, except Share data	Sep. 30, 2011	Sep. 30, 2010
Assets
Allowance for doubtful accounts	$ 89	$ 96
Liabilities and Equity
Common Stock, par value	$ 0.0139	$ 0.0139
Common Stock, shares authorized	1,800,000,000	1,800,000,000
Common Stock, shares issued	682,634,236	676,197,237
Treasury stock, at cost, shares	2,470,168	2,470,565