Long-Term Borrowings (Details) - USD ($) $ in Millions	Oct. 31, 2015	Oct. 31, 2014
Long-Term Borrowings
Total senior debt	$ 16,995.2	$ 17,071.3
Unamortized debt discount	(14.7)	(15.0)
Total	16,980.5	17,056.3
Principal Amounts of Long-Term Borrowings Maturing in Each of Next Five Years
2016	4,456.8
2017	4,500.0
2018	4,379.3
2019	2,479.3
2020	2,041.4
Medium-term notes due 2016-2025
Long-Term Borrowings
Total senior debt	16,482.8	16,573.0
Principal amount	$ 16,243.4	$ 16,374.9
Average interest rates (as a percent)	1.30%	1.10%
2.75% Senior notes due 2022
Long-Term Borrowings
Total senior debt	$ 512.4	$ 498.1
Debt instrument, stated interest rate (as a percent)	2.75%	2.75%
Principal amount	$ 500.0	$ 500.0
Portion of debt swapped to variable interest rates, amount	$ 500.0	$ 500.0
Variable interest rates, debt swaps (as a percent)	1.10%	0.90%
Other notes
Long-Term Borrowings
Total senior debt		$ 0.2