Quarterly Financial Data (Unaudited) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Jan. 28, 2017	Jul. 30, 2016	Apr. 30, 2016	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Restructuring Charges			$ 35
Restructuring Charges, Net of Tax			$ 21
Gain (Loss) on Equity Method Investment Dividends Or Distributions		$ (108)			$ 108	$ 0	$ 0
Gain (Loss) on Equity Method Investment Dividends or Distributions, Net of Tax		70
Gains (Losses) on Extinguishment of Debt					(36)	0	0
Tax Adjustments, Settlements, and Unusual Provisions	$ 42
Equity Method Investment, Realized Gain (Loss) on Disposal					$ 0	$ 78	$ 0
Third Party Sourcing Business [Member]
Equity Method Investment, Realized Gain (Loss) on Disposal				$ 78
Equity Method Investment, Realized Gain (Loss) on Disposal Net of Tax				$ 69
Fixed Rate 6.90% Notes Due July 2017 [Member]
Gains (Losses) on Extinguishment of Debt		(36)
Extinguishment of Debt, Gain (Loss), Net of Tax		$ (22)