Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2013	Oct. 31, 2012	Apr. 30, 2012
Fair Values of Financial Instruments
Securitization borrowings	$ 3,788.4	$ 3,574.8	$ 3,033.3
Current maturities of long-term borrowings	4,261.8	3,912.9	4,580.8
Long-term borrowings	14,141.6	14,769.9	13,213.7
Fair Value, Level 2
Fair Values of Financial Instruments
Securitization borrowings	3,794.0	3,584.0	3,041.0
Current maturities of long-term borrowings	4,320.0	3,947.0	4,636.0
Long-term borrowings	14,327.0	15,048.0	13,505.0
Fair Value, Level 3
Fair Values of Financial Instruments
Receivables financed - net	23,391	21,455	20,256
Retail notes securitized - net	3,785	3,615	3,124
Carrying Value
Fair Values of Financial Instruments
Receivables financed - net	23,430	21,472	20,245
Retail notes securitized - net	3,788	3,618	3,116
Securitization borrowings	3,788.0	3,575.0	3,033.0
Current maturities of long-term borrowings	4,262.0	3,913.0	4,581.0
Long-term borrowings	$ 14,142.0	$ 14,770.0	$ 13,214.0