Debt and Financing Arrangements (Details) (USD $)	12 Months Ended							3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Revolving Credit Facilities	Sep. 30, 2012 Revolving Credit Facilities	Sep. 30, 2013 Commercial Paper	Sep. 30, 2012 Commercial Paper	Sep. 30, 2013 Committed Five-year Credit Facility Revolving Credit Facilities	Mar. 31, 2011 Committed Four-year Credit Facility Revolving Credit Facilities	Sep. 30, 2013 Euro	Sep. 30, 2012 Euro
Debt Instrument [Line Items]
Total credit facility available								$ 2,500,000,000.0	$ 2,500,000,000.0
Length of credit facility (in years)								5 years	4 years
Maximum amount drawn on the credit facilities during period				0	0
Average outstanding commercial paper						1,123,000,000	1,287,000,000
Outstanding commercial paper at period end						0	186,000,000
Weighted-average interest rate of debt										3.10%	3.60%
Long-term Debt, Fiscal Year Maturity [Abstract]
Installments of long-term debt maturing 2014	819,000,000
Installments of long-term debt maturing 2015	254,000,000
Installments of long-term debt maturing 2016	808,000,000
Installments of long-term debt maturing 2017	885,000,000
Installments of long-term debt maturing 2018	19,000,000
Installments of long-term debt maturing 2019 and thereafter	2,594,000,000
Interest paid on short and long-term debt	$ 290,000,000	$ 283,000,000	$ 216,000,000