Derivative Instruments Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014	Jan. 31, 2015
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value		$ 10		$ 10
Foreign Currency Cash Flow Hedge Asset at Fair Value	$ 27		$ 27		$ 21
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Fair Value Hedge Asset at Fair Value	10	5	10	5	12
Foreign Currency Cash Flow Hedge Asset at Fair Value	27	0	27	0	21
Other Long-term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	0	10	0	10	$ 0
Other Comprehensive Income (Loss) [Member]
Derivatives, Fair Value [Line Items]
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	$ 2	$ 16	$ 6	$ 3