Long-Term Borrowings (Details) (USD $) In Millions, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Long-Term Borrowings
Total senior debt	$ 14,209.6	$ 14,786.6
Unamortized debt discount	(14.5)	(16.7)
Total	14,195.1	14,769.9
Principal Amounts of Long-Term Borrowings Maturing in Each of Next Five Years
2014	3,602
2015	3,890
2016	2,719
2017	2,400
2018	1,964
Medium-term notes due 2014-2023
Long-Term Borrowings
Total senior debt	13,693.4	14,230.3
Principal amount	13,447	13,759
Average interest rates (as a percent)	1.10%	1.50%
2.75% Senior notes due 2022
Long-Term Borrowings
Total senior debt	491.1	518.4
Debt instrument, stated interest rate (as a percent)	2.75%	2.75%
Principal amount	500	500
Portion of debt swapped to variable interest rates, amount	500	500
Variable interest rates, debt swaps (as a percent)	0.90%	1.10%
Other notes
Long-Term Borrowings
Total senior debt	$ 25.1	$ 37.9