Debt and Financing Arrangements Net Financing Charges (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest costs	$ 256	$ 239	$ 186
Banking fees and bond cost amortization	21	21	27
Interest income	(19)	(17)	(8)
Net foreign exchange results for financing activities	(10)	(10)	(31)
Net financing charges	$ 248	$ 233	$ 174