Contingencies Schedule of FCPA expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Foreign Corrupt Practices Act Expenses [Line Items]
Foreign Corrupt Practices Act Related Expenses	$ 41	$ 69	$ 137	$ 224
Compliance Programs and Organizational Enhancements [Member]
Foreign Corrupt Practices Act Expenses [Line Items]
Foreign Corrupt Practices Act Related Expenses	11	26	42	89
Inquiry and Investigation Expense [Member]
Foreign Corrupt Practices Act Expenses [Line Items]
Foreign Corrupt Practices Act Related Expenses	$ 30	$ 43	$ 95	$ 135