Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	0 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2013	Oct. 31, 2013	Nov. 14, 2007 Braun Hummel lawsuit	Oct. 13, 2006 Braun Hummel lawsuit	Oct. 31, 2013 Compliance Programs and Organizational Enhancements [Member]	Oct. 31, 2013 Compliance Programs and Organizational Enhancements [Member]	Oct. 31, 2013 Inquiry and Investigation Expense [Member]	Oct. 31, 2013 Inquiry and Investigation Expense [Member]
Loss Contingencies [Line Items]
Loss contingency, loss in period				$ 78
Litigation settlement, gross			188
Rate of post-judgment interest accrual			6.00%
Foreign Corrupt Practices Act related expenses	$ 69	$ 224			$ 26	$ 89	$ 43	$ 135