Reconciliation of the numerators and denominators (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Income from continuing operations	$ 1,433	$ 1,077	$ 1,099
Income Available to Common Shareholders
Income (loss) from discontinued operations	(218)	101	85
Basic income available to common shareholders	1,215	1,178	1,184
Interest expense, net of tax	0	0	1
Diluted income available to common shareholders	$ 1,215	$ 1,178	$ 1,185
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	666.9	683.7	681.5
Effect of dilutive securities:
Stock options and unvested restricted stock	7.9	5.5	5.2
Equity units	0	0	1.9
Diluted weighted average shares outstanding	674.8	689.2	688.6
Antidilutive Securities
Options to purchase common shares	0.1	0.8	1.4