Valuation and Qualifying Accounts (Details) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Accounts Receivable - Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts
Balance at beginning of period	$ 96	$ 99	$ 87
Provision charged to costs and expenses	37	42	51
Reserve adjustments	(23)	(24)	(11)
Accounts charged off	(24)	(25)	(28)
Acquisition of businesses	4	4
Currency translation	(1)
Balance at end of period	89	96	99
Deferred Tax Assets - Valuation Allowance [Member]
Valuation and Qualifying Accounts
Balance at beginning of period	739	816	373
Allowance established for new operating and other loss carryforwards	95	70	531
Acquisition of businesses	18		(19)
Allowance reversed for loss carryforwards utilized and other adjustments	(133)	(147)	(69)
Balance at end of period	$ 719	$ 739	$ 816