Valuation and Qualifying Accounts Schedule II (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Accounts Receivable - Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 78	$ 89	$ 96
Provision charged to costs and expenses	68	47	37
Reserve adjustments	(50)	(15)	(23)
Accounts charged off	(27)	(42)	(24)
Acquisition of businesses	1	0	4
Divestiture of businesses	(1)	0	0
Currency translation	0	(1)	(1)
Transfers to held for sale	(1)	0	0
Balance at end of period	68	78	89
Deferred Tax Assets - Valuation Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	766	719	739
Acquisition of businesses	0	0	18
Transfers to held for sale	(9)	0	0
Allowance provision for new operating and other loss carryforwards	165	119	95
Allowance reversed for loss carryforwards utilized and other adjustments	250	(72)	(133)
Balance at end of period	$ 1,172	$ 766	$ 719